fix(plat/arm): add RAS_FFH_SUPPORT check for RAS EHF priority

Define RAS EHF priority only if RAS_FFH_SUPPORT is enabled.

Signed-off-by: Omkar Anand Kulkarni <omkar.kulkarni@arm.com>
Change-Id: I0183a0af510337c8dfb9d12427541fa6c91bb4a5
diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index 16be971..6be6ffd 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -775,7 +775,9 @@
 #define PLAT_PERCPU_BAKERY_LOCK_SIZE		(1 * CACHE_WRITEBACK_GRANULE)
 
 /* Priority levels for ARM platforms */
+#if RAS_FFH_SUPPORT
 #define PLAT_RAS_PRI			0x10
+#endif
 #define PLAT_SDEI_CRITICAL_PRI		0x60
 #define PLAT_SDEI_NORMAL_PRI		0x70