feat(imx8mq): enable dram dvfs support on imx8mq

Enable DRAM DVFS support on i.MX8MQ.

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Change-Id: Id72c5eb9625936052ec51e5a52d9d31175ed1b1b
diff --git a/plat/imx/common/include/imx_sip_svc.h b/plat/imx/common/include/imx_sip_svc.h
index 1c319e8..0e91c71 100644
--- a/plat/imx/common/include/imx_sip_svc.h
+++ b/plat/imx/common/include/imx_sip_svc.h
@@ -57,6 +57,8 @@
 			 u_register_t x2, u_register_t x3);
 int imx_gpc_handler(uint32_t smc_fid, u_register_t x1,
 		    u_register_t x2, u_register_t x3);
+int dram_dvfs_handler(uint32_t smc_fid, void *handle,
+	u_register_t x1, u_register_t x2, u_register_t x3);
 #endif
 #if defined(PLAT_imx8mm) || defined(PLAT_imx8mn) || defined(PLAT_imx8mp)
 int dram_dvfs_handler(uint32_t smc_fid, void *handle,