soc: rockchip: rockchip_dmc: add missing CONFIG_

Commit 1763310 ("soc: rockchip: Add dummy
rockchip_pm_register_notify_to_dmc") make power domain driver
unable to receive dmc notify. That will make DDR freq stop or
power domain unable to idle or deidle.

Fixes: 1763310 ("soc: rockchip: Add dummy rockchip_pm_register_notify_to_dmc")
Change-Id: I30970507ce56a663198c777ddf691ccfbf12611e
Signed-off-by: Tao Huang <huangtao@rock-chips.com>

Author: rkhuangtao

include/soc/rockchip/rockchip_dmc.h

@@ -15,7 +15,7 @@
 
 #include <linux/devfreq.h>
 
-#ifdef ROCKCHIP_PM_DOMAINS
+#ifdef CONFIG_ROCKCHIP_PM_DOMAINS
 int rockchip_pm_register_notify_to_dmc(struct devfreq *devfreq);
 #else
 static inline int rockchip_pm_register_notify_to_dmc(struct devfreq *devfreq)