drm/gm12u320: Move driver to drm/tiny

Move the driver to the new haven for tiny DRM drivers.

Cc: Hans de Goede <hdegoede@redhat.com>
Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190725105132.22545-4-noralf@tronnes.org

drivers/gpu/drm/tiny/Kconfig

@@ -1,4 +1,14 @@
 # SPDX-License-Identifier: GPL-2.0-only
+
+config DRM_GM12U320
+	tristate "GM12U320 driver for USB projectors"
+	depends on DRM && USB
+	select DRM_KMS_HELPER
+	select DRM_GEM_SHMEM_HELPER
+	help
+	 This is a KMS driver for projectors which use the GM12U320 chipset
+	 for video transfer over USB2/3, such as the Acer C120 mini projector.
+
 config TINYDRM_HX8357D
 	tristate "DRM support for HX8357D display panels"
 	depends on DRM && SPI