Rework use of ARM GIC drivers on ARM platforms

Suport for ARM GIC v2.0 and v3.0 drivers has been reworked to create three
separate drivers instead of providing a single driver that can work on both
versions of the GIC architecture. These drivers correspond to the following
software use cases:

1. A GICv2 only driver that can run only on ARM GIC v2.0 implementations
   e.g. GIC-400

2. A GICv3 only driver that can run only on ARM GIC v3.0 implementations
   e.g. GIC-500 in a mode where all interrupt regimes use GICv3 features

3. A deprecated GICv3 driver that operates in legacy mode. This driver can
   operate only in the GICv2 mode in the secure world. On a GICv3 system, this
   driver allows normal world to run in either GICv3 mode (asymmetric mode)
   or in the GICv2 mode. Both modes of operation are deprecated on GICv3
   systems.

ARM platforms implement both versions of the GIC architecture. This patch adds a
layer of abstraction to help ARM platform ports chose the right GIC driver and
corresponding platform support. This is as described below:

1. A set of ARM common functions have been introduced to initialise the GIC and
   the driver during cold and warm boot. These functions are prefixed as
   "plat_arm_gic_". Weak definitions of these functions have been provided for
   each type of driver.

2. Each platform includes the sources that implement the right functions
   directly into the its makefile. The FVP can be instantiated with different
   versions of the GIC architecture. It uses the FVP_USE_GIC_DRIVER build option
   to specify which of the three drivers should be included in the build.

3. A list of secure interrupts has to be provided to initialise each of the
  three GIC drivers. For GIC v3.0 the interrupt ids have to be further
  categorised as Group 0 and Group 1 Secure interrupts. For GIC v2.0, the two
  types are merged and treated as Group 0 interrupts.

  The two lists of interrupts are exported from the platform_def.h. The lists
  are constructed by adding a list of board specific interrupt ids to a list of
  ids common to all ARM platforms and Compute sub-systems.

This patch also makes some fields of `arm_config` data structure in FVP redundant
and these unused fields are removed.

Change-Id: Ibc8c087be7a8a6b041b78c2c3bd0c648cd2035d8

plat/arm/common/tsp/arm_tsp_setup.c

@@ -89,7 +89,7 @@ void tsp_early_platform_setup(void)
  ******************************************************************************/
 void tsp_platform_setup(void)
 {
-	plat_arm_gic_init();
+	plat_arm_gic_driver_init();
 }
 
 /*******************************************************************************

plat/arm/css/common/css_common.mk

@@ -32,8 +32,7 @@ PLAT_INCLUDES		+=	-Iinclude/plat/arm/css/common			\
 				-Iinclude/plat/arm/css/common/aarch64
 
 
-PLAT_BL_COMMON_SOURCES	+=	plat/arm/css/common/aarch64/css_helpers.S	\
-				plat/arm/css/common/css_common.c
+PLAT_BL_COMMON_SOURCES	+=	plat/arm/css/common/aarch64/css_helpers.S
 
 #BL1_SOURCES		+=
 

plat/arm/css/common/css_pm.c

@@ -30,7 +30,6 @@
 
 #include <arch_helpers.h>
 #include <assert.h>
-#include <arm_gic.h>
 #include <cassert.h>
 #include <cci.h>
 #include <css_pm.h>
@@ -127,10 +126,11 @@ void css_pwr_domain_on_finish(const psci_power_state_t *target_state)
 
 	css_pwr_domain_on_finisher_common(target_state);
 
+	/* Program the gic per-cpu distributor or re-distributor interface */
+	plat_arm_gic_pcpu_init();
+
 	/* Enable the gic cpu interface */
-	arm_gic_cpuif_setup();
-	/* Program the gic per-cpu distributor interface */
-	arm_gic_pcpu_distif_setup();
+	plat_arm_gic_cpuif_enable();
 }
 
 /*******************************************************************************
@@ -145,7 +145,7 @@ static void css_power_down_common(const psci_power_state_t *target_state)
 	uint32_t system_state = scpi_power_on;
 
 	/* Prevent interrupts from spuriously waking up this cpu */
-	arm_gic_cpuif_deactivate();
+	plat_arm_gic_cpuif_disable();
 
 	/* Check if power down at system power domain level is requested */
 	if (CSS_SYSTEM_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF)
@@ -213,7 +213,7 @@ void css_pwr_domain_suspend_finish(
 		arm_system_pwr_domain_resume();
 	else
 		/* Enable the gic cpu interface */
-		arm_gic_cpuif_setup();
+		plat_arm_gic_cpuif_enable();
 
 	css_pwr_domain_on_finisher_common(target_state);
 }