drm/bridge: analogix_dp: Remove bridge disabing and panel unpreparing in analogix_dp_...

drm/bridge: analogix_dp: Remove bridge disabing and panel unpreparing in analogix_dp_unbind()

The analogix_dp_unbind() should be balanced with analogix_dp_bind().
There are no bridge enabling and panel preparing in analogix_dp_bind(),
so it should be reasonable to remove the bridge disabing and panel
unpreparing in analogix_dp_unbind().

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> # rk3588
Link: https://patch.msgid.link/20260413132551.1049307-8-damon.ding@rock-chips.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>