media: platform: Add C3 MIPI adapter driver

Add a driver for the MIPI adapter unit found on the Amlogic C3 SoC.

This driver is used to align the MIPI data from the MIPI CSI-2 receiver
unit and send the aligned data to the ISP unit.

Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Keke Li <keke.li@amlogic.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>