drm/rockchip: Add VOP2 driver

The VOP2 unit is found on Rockchip SoCs beginning with rk3566/rk3568.
It replaces the VOP unit found in the older Rockchip SoCs.

This driver has been derived from the downstream Rockchip Kernel and
heavily modified:

- All nonstandard DRM properties have been removed
- dropped struct vop2_plane_state and pass around less data between
  functions
- Dropped all DRM_FORMAT_* not known on upstream
- rework register access to get rid of excessively used macros
- Drop all waiting for framesyncs

The driver is tested with HDMI and MIPI-DSI display on a RK3568-EVB
board. Overlay support is tested with the modetest utility. AFBC support
on the cluster windows is tested with weston-simple-dmabuf-egl on
weston using the (yet to be upstreamed) panfrost driver support.

Signed-off-by: Andy Yan <[email protected]>
Co-Developed-by: Sascha Hauer <[email protected]>
Signed-off-by: Sascha Hauer <[email protected]>
Tested-by: Michael Riesch <[email protected]>
[dt-binding-header:]
Acked-by: Rob Herring <[email protected]>
[moved dt-binding header from dt-nodes patch to here
 and made checkpatch --strict happier]
Signed-off-by: Heiko Stuebner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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