drm: shmobile: Reduce include dependencies

This file doesn't need anything provided by <linux/kernel.h>.
All it needs are some types, which are provided by <drm/drm_mode.h>.

Drop unneeded <linux/kernel.h> completely.

Signed-off-by: Andy Shevchenko <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Imre Deak <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

include/linux/platform_data/shmob_drm.h

···
 #ifndef __SHMOB_DRM_H__
 #define __SHMOB_DRM_H__
 
-#include <linux/kernel.h>
-
 #include <drm/drm_mode.h>
 
 enum shmob_drm_clk_source {