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/imx8m/include/gpc.h b/plat/imx/imx8m/include/gpc.h
index eb33abd..8eb3e06 100644
--- a/plat/imx/imx8m/include/gpc.h
+++ b/plat/imx/imx8m/include/gpc.h
@@ -80,6 +80,7 @@
 
 #if defined(PLAT_imx8mq)
 void imx_gpc_set_a53_core_awake(uint32_t core_id);
+void imx_gpc_core_wake(uint32_t cpumask);
 #endif
 
 #endif /*IMX8M_GPC_H */