drm/rockchip: vop2: Enforce AFBC source alignment in plane_check

drm/rockchip: vop2: Enforce AFBC source alignment in plane_check

Planes can only source AFBC framebuffers at multiples of 4px wide on
RK3566/RK3568. Instead of clipping on all SoCs when the user asks for an
unaligned source rectangle, reject the configuration in the plane's
atomic check on RK3566/RK3568 only.

Signed-off-by: Daniel Stone <daniels@collabora.com>
[Make RK3566/RK3568 specific, reword message, s/byte/pixel/]
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patch.msgid.link/20251215-vop2-atomic-fixups-v5-5-83463c075a8d@collabora.com