feat(imx8ulp): add the initial XRDC support

Add the initial xRDC support on i.MX8ULP.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: I93ea8e2cebb049e6f20e71cfe50c7583a3228f38
diff --git a/plat/imx/common/imx_sip_svc.c b/plat/imx/common/imx_sip_svc.c
index 42d400e..b6b8ff8 100644
--- a/plat/imx/common/imx_sip_svc.c
+++ b/plat/imx/common/imx_sip_svc.c
@@ -37,6 +37,9 @@
 		scmi_smt_fastcall_smc_entry(0);
 		SMC_RET1(handle, 0);
 		break;
+	case IMX_SIP_HIFI_XRDC:
+		SMC_RET1(handle, imx_hifi_xrdc(smc_fid));
+		break;
 #endif
 #if defined(PLAT_imx8mq)
 	case IMX_SIP_GET_SOC_INFO: