fix(plat/sgi): update PLAT_SP_PRI macro definition

PLAT_SP_PRI EHF priority is defined to be same as the PLAT_RAS_PRI EHF
priority. But PLAT_RAS_PRIORITY is defined only if RAS_FFH_SUPPORT is
enabled. This patch defines priority value for PLAT_SP_PRI if
RAS_FFH_SUPPORT is not enabled.

Signed-off-by: Omkar Anand Kulkarni <omkar.kulkarni@arm.com>
Change-Id: Ib3747317d2ecc088fbbf1f5f283726a330454c93
diff --git a/plat/arm/css/sgi/include/sgi_base_platform_def.h b/plat/arm/css/sgi/include/sgi_base_platform_def.h
index c6cf0e6..b9c785f 100644
--- a/plat/arm/css/sgi/include/sgi_base_platform_def.h
+++ b/plat/arm/css/sgi/include/sgi_base_platform_def.h
@@ -204,7 +204,11 @@
 					SOC_CSS_DEVICE_SIZE,	\
 					MT_DEVICE | MT_RW | MT_SECURE | MT_USER)
 
+#if RAS_FFH_SUPPORT
 #define PLAT_SP_PRI				PLAT_RAS_PRI
+#else
+#define PLAT_SP_PRI				0x10
+#endif
 
 #if SPM_MM && RAS_FFH_SUPPORT
 /*