drm/msm: update debug support in msm drm driver

MSM drm driver creates multiple debug directories
for debug support; "evt_dbg", "debug", etc. This
patch unifies the debug support and creates all
debug file nodes within root "debug" folder. It
also fixes the event logging and pixel format
message logging.

Change-Id: Ie23e76b2e4b4aaceadf2c2afe6a4d9c6cc629bb3
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index f2fccd7..da76fbc 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -492,6 +492,9 @@
 
 	/* whether registered and drm_dev_unregister should be called */
 	bool registered;
+
+	/* msm drv debug root node */
+	struct dentry *debug_root;
 };
 
 struct msm_format {