feat(drtm): add platform functions for DRTM

Added platform hooks to retrieve DRTM features and
address map.
Additionally, implemented these hooks for the FVP platform.

Signed-off-by: John Powell <john.powell@arm.com>
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I5621cc9807ffff8139ae8876250147f7b2c76759
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 4602276..eb2b5e5 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -415,6 +415,8 @@
 
 ifeq (${DRTM_SUPPORT}, 1)
 BL31_SOURCES   += plat/arm/board/fvp/fvp_drtm_dma_prot.c	\
+		  plat/arm/board/fvp/fvp_drtm_measurement.c	\
+		  plat/arm/board/fvp/fvp_drtm_stub.c	\
 		  plat/arm/common/arm_dyn_cfg.c
 endif