drm/bridge: analogix_dp: Move &drm_bridge_funcs.mode_set to &drm_bridge_funcs.atomic_...

drm/bridge: analogix_dp: Move &drm_bridge_funcs.mode_set to &drm_bridge_funcs.atomic_enable

According to the include/drm/drm_bridge.h, the callback
&drm_bridge_funcs.mode_set is deprecated and it should be better to
include the mode setting in the &drm_bridge_funcs.atomic_enable instead.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Heiko Stuebner <heiko@sntech.de> (on rk3588)
Link: https://patch.msgid.link/20251217093321.3108939-4-damon.ding@rock-chips.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>