disp: msm: make msm_drm into single module

Make msm_drm into single module and all child driver
registers and unregisters are handled from parent's
register and unregister respectively.

Change-Id: I017513d1de3b6b25dd5543d7fa7741c0bac1740d
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>

msm/dp/dp_mst_drm.h

@@ -12,7 +12,7 @@
 
 #include "dp_display.h"
 
-#ifdef CONFIG_DRM_MSM_DP_MST
+#if IS_ENABLED(CONFIG_DRM_MSM_DP_MST)
 
 /**
  * dp_mst_drm_bridge_init - initialize mst bridge
@@ -60,6 +60,6 @@ static inline int dp_mst_deinit(struct dp_display *dp_display)
 {
 	return 0;
 }
-#endif
+#endif /* CONFIG_DRM_MSM_DP_MST */
 
 #endif /* _DP_MST_DRM_H_ */