feat(realm): align RSI ABIs with RMM spec 1.1-alp12

This syncs the naming of SMC RSI commands with TF-RMM.

Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Change-Id: I7905f0f3788c0c659ba6f787fb002d1c5997d289
diff --git a/realm/realm_helpers.c b/realm/realm_helpers.c
index 1887164..e950d3a 100644
--- a/realm/realm_helpers.c
+++ b/realm/realm_helpers.c
@@ -27,7 +27,7 @@
 	struct rsi_host_call host_cal __aligned(sizeof(struct rsi_host_call));
 
 	host_cal.imm = HOST_CALL_GET_SHARED_BUFF_CMD;
-	res = tftf_smc(&(smc_args) {RSI_HOST_CALL, (u_register_t)&host_cal,
+	res = tftf_smc(&(smc_args) {SMC_RSI_HOST_CALL, (u_register_t)&host_cal,
 		0UL, 0UL, 0UL, 0UL, 0UL, 0UL});
 
 	if (res.ret0 != RSI_SUCCESS) {