drm/bridge: analogix_dp: Add support to get panel from the DP AUX bus

drm/bridge: analogix_dp: Add support to get panel from the DP AUX bus

The main modification is moving the DP AUX initialization from function
analogix_dp_bind() to analogix_dp_probe(). In order to get the EDID of
eDP panel during probing, it is also needed to advance PM operations to
ensure that eDP controller and phy are prepared for AUX transmission.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20250310104114.2608063-7-damon.ding@rock-chips.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>