fix(ras): remove RAS_FFH_SUPPORT and introduce FFH_SUPPORT

This patch removes RAS_FFH_SUPPORT macro which is the combination of
ENABLE_FEAT_RAS and HANDLE_EA_EL3_FIRST_NS. Instead introduce an
internal macro FFH_SUPPORT which gets enabled when platforms wants
to enable lower EL EA handling at EL3. The internal macro FFH_SUPPORT
will be automatically enabled if HANDLE_EA_EL3_FIRST_NS is enabled.
FFH_SUPPORT along with ENABLE_FEAT_RAS will be used in source files
to provide equivalent check which was provided by RAS_FFH_SUPPORT
earlier. In generic code we needed a macro which could abstract both
HANDLE_EA_EL3_FIRST_NS and RAS_FFH_SUPPORT macros that had limitations.
Former was tied up with NS world only while the latter was tied to RAS
feature.

This is to allow Secure/Realm world to have their own FFH macros
in future.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Ie5692ccbf462f5dcc3f005a5beea5aa35124ac73
diff --git a/plat/nvidia/tegra/soc/t194/platform_t194.mk b/plat/nvidia/tegra/soc/t194/platform_t194.mk
index 289e921..e6e0b5e 100644
--- a/plat/nvidia/tegra/soc/t194/platform_t194.mk
+++ b/plat/nvidia/tegra/soc/t194/platform_t194.mk
@@ -37,7 +37,7 @@
 
 # enable RAS handling
 HANDLE_EA_EL3_FIRST_NS			:= 1
-RAS_FFH_SUPPORT				:= 1
+ENABLE_FEAT_RAS				:= 1
 
 # platform files
 PLAT_INCLUDES		+=	-Iplat/nvidia/tegra/include/t194 \
@@ -71,7 +71,7 @@
 endif
 
 # RAS sources
-ifeq (${RAS_FFH_SUPPORT},1)
+ifeq (${ENABLE_FEAT_RAS}-${HANDLE_EA_EL3_FIRST_NS},1-1)
 BL31_SOURCES		+=	lib/extensions/ras/std_err_record.c		\
 				lib/extensions/ras/ras_common.c			\
 				${SOC_DIR}/plat_ras.c