plat/sgm775: Add support for dynamic config using fconf

1. Necessary changes to platform makefile to include fw_config
device tree and package it in fip.bin

2. Removed hw_config node from fw_config dts as there is no
HW_CONFIG device tree source for sgm775

3. Added mbedtls_heap related properties for TBBR functionality

Change-Id: I26b940c65b17ad2fb5537141f8649785bb0fd4ad
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>

plat/arm/board/sgm775/fdts/sgm775_fw_config.dts

@@ -18,12 +18,6 @@
 			max-size = <0x200>;
 			id = <TB_FW_CONFIG_ID>;
 		};
-
-		hw-config {
-			load-address = <0x0 0x83000000>;
-			max-size = <0x01000000>;
-			id = <HW_CONFIG_ID>;
-		};
 	};
 
 	tb_fw-config {
@@ -31,5 +25,17 @@
 
 		/* Disable authentication for development */
 		disable_auth = <0x0>;
+
+		/*
+		 * The following two entries are placeholders for Mbed TLS
+		 * heap information. The default values don't matter since
+		 * they will be overwritten by BL1.
+		 * In case of having shared Mbed TLS heap between BL1 and BL2,
+		 * BL1 will populate these two properties with the respective
+		 * info about the shared heap. This info will be available for
+		 * BL2 in order to locate and re-use the heap.
+		 */
+		mbedtls_heap_addr = <0x0 0x0>;
+		mbedtls_heap_size = <0x0>;
 	};
 };

plat/arm/board/sgm775/platform.mk

@@ -8,7 +8,12 @@ include plat/arm/css/sgm/sgm-common.mk
 
 SGM775_BASE= plat/arm/board/sgm775
 
-FDT_SOURCES += ${SGM775_BASE}/fdts/sgm775_fw_config.dts
+# Add the FDT_SOURCES and options for Dynamic Config
+FDT_SOURCES            +=      ${SGM775_BASE}/fdts/${PLAT}_fw_config.dts
+TB_FW_CONFIG           :=      ${BUILD_PLAT}/fdts/${PLAT}_fw_config.dtb
+
+# Add the TB_FW_CONFIG to FIP and specify the same to certtool
+$(eval $(call TOOL_ADD_PAYLOAD,${TB_FW_CONFIG},--tb-fw-config))
 
 PLAT_INCLUDES +=-I${SGM775_BASE}/include/