media: nxp: Add i.MX8 ISI driver

The Image Sensing Interface (ISI) combines image processing pipelines
with DMA engines to process and capture frames originating from a
variety of sources. The inputs to the ISI go through Pixel Link
interfaces, and their number and nature is SoC-dependent. They cover
both capture interfaces (MIPI CSI-2 RX, HDMI RX) and memory inputs.

Signed-off-by: Christian Hemp <c.hemp@phytec.de>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Guoniu Zhou <guoniu.zhou@nxp.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Tested-by: Adam Ford <aford173@gmail.com> #imx8mn-beacon
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>