drm/rockchip: vop: group vop registers

drm/rockchip: vop: group vop registers

Grouping the vop registers facilitates make register
definition clearer, and also is useful for different vop
reuse the same group register.

Signed-off-by: Mark Yao <[email protected]>
Reviewed-by: Jeffy Chen <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]