drm/bridge: analogix_dp: don't adjust further when clock recovery succeeded

Take a early return from the clock recovery training when the sink reports
CR_DONE for all lanes. There is no point in trying to adjust the link
parameters further.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240318203925.2837689-3-l.stach@pengutronix.de