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/arm/board/rdn2/rdn2_security.c b/plat/arm/board/rdn2/rdn2_security.c
index b836a7f..7cd4a1c 100644
--- a/plat/arm/board/rdn2/rdn2_security.c
+++ b/plat/arm/board/rdn2/rdn2_security.c
@@ -15,7 +15,7 @@
 
 static const arm_tzc_regions_info_t tzc_regions[] = {
 	ARM_TZC_REGIONS_DEF,
-#if RAS_FFH_SUPPORT
+#if ENABLE_FEAT_RAS && FFH_SUPPORT
 	RDN2_TZC_CPER_REGION,
 #endif
 	{}