imx-drm: ipu-dc: disable DC module when not in use

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc drivers/staging/imx-drm/ipu-v3/imx-ipu-v3.h
Simple merge

diff --cc drivers/staging/imx-drm/ipu-v3/ipu-dc.c
Simple merge

diff --cc drivers/staging/imx-drm/ipuv3-crtc.c
Simple merge