drm: shmobile: Add dependency on BACKLIGHT_CLASS_DEVICE
drm: shmobile: Add dependency on BACKLIGHT_CLASS_DEVICE

The driver registers a backlight device and thus requires
BACKLIGHT_CLASS_DEVICE to be selected to avoid compilation breakages.

Cc: 4fbacc2fa0ffdbb11bf1ad6925b886ebd08dd15f@vger.kernel.org
Reported-by: Russell King <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@arm.linux.org.uk>
Signed-off-by: Laurent Pinchart <3ded2f39a78f0d7044839546f95841842b4d7c96@ideasonboard.com>
Signed-off-by: Dave Airlie <f2295d84e358395675bc8031be58672073ae065e@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs