feat(rmm): update RMI VERSION command as per EAC5

This patch adds necessary support for RMI_VERSION command.
This patch sets RMI version numbers to 1.0 as per
RMM Specification 1.0-eac5.

Change-Id: If7f88d5b5efa58716752488108fa110fc71ae836
Signed-off-by: Shruti Gupta <shruti.gupta@arm.com>
diff --git a/include/services/rmmd_svc.h b/include/services/rmmd_svc.h
index 55d778e..a567d28 100644
--- a/include/services/rmmd_svc.h
+++ b/include/services/rmmd_svc.h
@@ -91,6 +91,10 @@
 #define E_RMM_NOMEM			-4
 #define E_RMM_INVAL			-5
 
+/* Return error codes from RMI SMCs */
+#define RMI_SUCCESS			0
+#define RMI_ERROR_INPUT			1
+
 /* Acceptable SHA sizes for Challenge object */
 #define SHA256_DIGEST_SIZE	32U
 #define SHA384_DIGEST_SIZE	48U