feat(rmm-eac4): Add support for new RMI_VERSION cmd

This patch adds the necessary support for the new RMI_VERSION
command as mentioned EAC4 specification.

Signed-off-by: Soby Mathew <soby.mathew@arm.com>
Change-Id: I4629357b42d05d291fd81aaea97edf0a0c4518f5
diff --git a/runtime/include/smc-handler.h b/runtime/include/smc-handler.h
index 685f3c5..5965078 100644
--- a/runtime/include/smc-handler.h
+++ b/runtime/include/smc-handler.h
@@ -8,7 +8,8 @@
 
 #include <smc.h>
 
-unsigned long smc_version(void);
+void smc_version(unsigned long rmi_version,
+				struct smc_result *res);
 
 void smc_read_feature_register(unsigned long index,
 				struct smc_result *res);