feat(fvp): add crypto support in BL31

DRTM implementation needs crypto support in BL31 to calculate
hash of various DRTM components

Signed-off-by: Manish V Badarkhe <manish.badarkhe@arm.com>
Change-Id: I659ce8e54550946db253d23f150cca8b2fa7b880
diff --git a/plat/arm/board/fvp/platform.mk b/plat/arm/board/fvp/platform.mk
index 811b275..4602276 100644
--- a/plat/arm/board/fvp/platform.mk
+++ b/plat/arm/board/fvp/platform.mk
@@ -414,7 +414,8 @@
 endif
 
 ifeq (${DRTM_SUPPORT}, 1)
-BL31_SOURCES   += plat/arm/board/fvp/fvp_drtm_dma_prot.c
+BL31_SOURCES   += plat/arm/board/fvp/fvp_drtm_dma_prot.c	\
+		  plat/arm/common/arm_dyn_cfg.c
 endif
 
 ifeq (${TRUSTED_BOARD_BOOT}, 1)