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_plane.c b/realm/realm_plane.c
index a29a1ca..ff42ba9 100644
--- a/realm/realm_plane.c
+++ b/realm/realm_plane.c
@@ -64,7 +64,7 @@
 	host_cal.imm = exit_code;
 	host_cal.gprs[0] = plane_num;
 	host_cal.gprs[1] = read_mpidr_el1();
-	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});
 	return res.ret0;
 }