fix(fvp): correct ehf priority for SPM_MM

PLAT_SP_PRI is used by SPM_MM and it is assigned same value as RAS
priority. Which is not allowed by exception handling framework and
causes build failure if both SPM_MM and RAS is enabled.

To fix this problem assign SP a different priority than RAS.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: Iff64ac547f0966c0d94ac7c3ab0eb1e3151fb314
diff --git a/plat/arm/board/fvp/include/platform_def.h b/plat/arm/board/fvp/include/platform_def.h
index 84e2e82..79d7451 100644
--- a/plat/arm/board/fvp/include/platform_def.h
+++ b/plat/arm/board/fvp/include/platform_def.h
@@ -404,7 +404,7 @@
 #define PLAT_ARM_SP_IMAGE_STACK_BASE	(PLAT_SP_IMAGE_NS_BUF_BASE +	\
 					 PLAT_SP_IMAGE_NS_BUF_SIZE)
 
-#define PLAT_SP_PRI			PLAT_RAS_PRI
+#define PLAT_SP_PRI			0x20
 
 /*
  * Physical and virtual address space limits for MMU in AARCH64 & AARCH32 modes