drm: platform: Don't initialize driver-private data

Platform device drivers usually use the driver-private data for their
own purposes. Having it overwritten by drm_platform_init() is confusing
and error-prone.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --cc drivers/gpu/drm/drm_platform.c
Simple merge

diff --cc drivers/gpu/drm/shmobile/shmob_drm_drv.c
Simple merge