staging/drm: imx: add missing dependencies

The imx DRM driver needs a couple of extra Kconfig dependencies
to avoid random build failures:

drivers/staging/imx-drm/ipuv3-crtc.c:448:
 undefined reference to `ipu_idmac_put'
 drivers/staging/imx-drm/ipuv3-crtc.c:450: undefined reference to
 `ipu_dmfc_put' drivers/staging/imx-drm/ipuv3-crtc.c:452:
 undefined reference to `ipu_dp_put'
 drivers/staging/imx-drm/ipuv3-crtc.c:454: undefined reference to
 `ipu_di_put'
drivers/built-in.o: In function `ipu_probe':
 :(.text+0x4b4174): undefined reference to `device_reset'
drivers/built-in.o: In function `imx_tve_probe':
 drivers/staging/imx-drm/imx-tve.c:648: undefined reference to
 `devm_regmap_init_mmio_clk'
drivers/built-in.o: In function
 `imx_pd_connector_get_modes':
 drivers/staging/imx-drm/parallel-display.c:78: undefined
 reference to `of_get_drm_display_mode'

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>