media: staging/imx7: add MIPI CSI-2 receiver subdev for i.MX7

Adds MIPI CSI-2 subdev for i.MX7 to connect with sensors with a MIPI
CSI-2 interface.
Signed-off-by: NRui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil-cisco@xs4all.nl: clean up some alignment warnings]
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/imx/Makefile

@@ -14,3 +14,4 @@ obj-$(CONFIG_VIDEO_IMX_CSI) += imx-media-csi.o
 obj-$(CONFIG_VIDEO_IMX_CSI) += imx6-mipi-csi2.o
 
 obj-$(CONFIG_VIDEO_IMX7_CSI) += imx7-media-csi.o
+obj-$(CONFIG_VIDEO_IMX7_CSI) += imx7-mipi-csis.o