drm/bridge: use atomic enable/disable callbacks for panel bridge

drm/bridge: use atomic enable/disable callbacks for panel bridge

Use atomic variants for panel bridge callback functions such that
certain states like self-refresh can be accessed as part of
enable/disable sequence.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Patchwork: https://patchwork.freedesktop.org/patch/524720/
Link: https://lore.kernel.org/r/1677774797-31063-3-git-send-email-quic_vpolimer@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>