drm/rockchip: vop2: Fix the windows switch between different layers

Every layer of vop2 should bind a window, and we also need to make
sure that this window is not used by other layer.

0x5 is a reserved layer sel value on rk3568, but it will select
Cluster3 on rk3588, configure unused layers to 0x5  will lead
alpha blending error on rk3588.

When we bind a window from layerM to layerN, we move the old window
on layerN to layerM.

Fixes: 604be855 ("drm/rockchip: Add VOP2 driver")
Tested-by: Derek Foreman <derek.foreman@collabora.com>
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20241214081719.3330518-3-andyshrk@163.com