media: staging: imx: add isi capture driver support for imx8qm/qxp

commit 4845efc01aea4663d06dd05c7eb7c7c0ca115ca6 from
https://github.com/nxp-imx/linux-imx

ISI is an image sensor interface which used to process image data from
camera sensor or memory. Add ISI capture function driver for it.

Signed-off-by: Guoniu.zhou <guoniu.zhou@nxp.com>
[Xiaolei: commit bb36b0321167 has already included "if
VIDEO_IMX_CAPTURE", fixes the conflicts caused by that.]
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>