Align service locator implementations for Linux with RPC layer changes

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I7e8527c9217b95b4792f2dd24d9bccab2b81ee82
diff --git a/protocols/service/smm_variable/smm_variable_proto.h b/protocols/service/smm_variable/smm_variable_proto.h
index a47be10..a42ff06 100644
--- a/protocols/service/smm_variable/smm_variable_proto.h
+++ b/protocols/service/smm_variable/smm_variable_proto.h
@@ -14,4 +14,6 @@
 #define SMM_VARIABLE_GUID \
 	{0xed32d533, 0x99e6, 0x4209, { 0x9c, 0xc0, 0x2d, 0x72, 0xcd, 0xd9, 0x98, 0xa7 }}
 
+#define SMM_VARIABLE_CANONICAL_GUID	"ed32d533-99e6-4209-9cc0-2d72cdd998a7"
+
 #endif /* TS_SMM_VARIABLE_PROTO_H */