feat(fvp): add plat API to set and get the DRTM error

Added a platform function to set and get DRTM error.
Also, added a platform function to reset the system.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I471f2387f8c78b21a06af063a6fa02cda3646557
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index eb2b5e5..5a21ff6 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -414,10 +414,13 @@
 endif
 
 ifeq (${DRTM_SUPPORT}, 1)
-BL31_SOURCES   += plat/arm/board/fvp/fvp_drtm_dma_prot.c	\
+BL31_SOURCES   += plat/arm/board/fvp/fvp_drtm_addr.c	\
+		  plat/arm/board/fvp/fvp_drtm_dma_prot.c	\
+		  plat/arm/board/fvp/fvp_drtm_err.c	\
 		  plat/arm/board/fvp/fvp_drtm_measurement.c	\
 		  plat/arm/board/fvp/fvp_drtm_stub.c	\
-		  plat/arm/common/arm_dyn_cfg.c
+		  plat/arm/common/arm_dyn_cfg.c		\
+		  plat/arm/board/fvp/fvp_err.c
 endif
 
 ifeq (${TRUSTED_BOARD_BOOT}, 1)