gicv2: Fix support for systems without secure interrupts

Accessing the interrupt_props array only happens inside a loop over
interrupt_props_num, so the GICv2 driver can cope with no secure
interrupts. As in fact we have already some asserts in place that
respect that, lets change the final place where we insist on a non-NULL
pointer to relax that.
This enables GICv2 platforms which have no need for a secure interrupt.

This only covers the non-deprecated code paths.

Also we remove a now redundant assert().

Change-Id: Id100ea978643d8558335ad28649d55743fe9bd4c
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

drivers/arm/gic/v2/gicv2_main.c

@@ -178,9 +178,6 @@ void gicv2_driver_init(const gicv2_driver_data_t *plat_driver_data)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 
-		/* The platform should provide a list of secure interrupts */
-		assert(plat_driver_data->g0_interrupt_array);
-
 		/*
 		 * If there are no interrupts of a particular type, then the
 		 * number of interrupts of that type should be 0 and vice-versa.
@@ -195,8 +192,8 @@ void gicv2_driver_init(const gicv2_driver_data_t *plat_driver_data)
 		WARN("Please migrate to using an interrupt_prop_t array\n");
 	}
 #else
-	assert(plat_driver_data->interrupt_props != NULL);
-	assert(plat_driver_data->interrupt_props_num > 0);
+	assert(plat_driver_data->interrupt_props_num > 0 ?
+			plat_driver_data->interrupt_props != NULL : 1);
 #endif
 
 	/* Ensure that this is a GICv2 system */