media: rockchip: add driver for the rockchip camera interface

media: rockchip: add driver for the rockchip camera interface

Add the skeleton for a media controller centric V4L2 driver for the
Rockchip Camera Interface (CIF).
The skeleton features support for the PX30 Video Input Processor (VIP)
and the RK3568 Video Capture (VICAP) unit.

Tested-by: Gerald Loacker <gerald.loacker@wolfvision.net>
Reviewed-by: Gerald Loacker <gerald.loacker@wolfvision.net>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Mehdi Djait <mehdi.djait@linux.intel.com>
Signed-off-by: Michael Riesch <michael.riesch@collabora.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>