MLK-19252-2 drm/bridge: adv7511: realize mode_fixup for lanes fixup

MLK-19252-2 drm/bridge: adv7511: realize mode_fixup for lanes fixup

In the current implementation, the data lanes fixup is done in
the Bridge's mode_set() function which is too late to give the
upper layer Bridge a chance to check this change to be supported
or not and a chance to refuse this commit if it does not support
the requested data lanes number.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>
(cherry picked from commit c97f9febd7e42d7865921e2bb56648ebb13c0761)
(cherry picked from commit 36f25495a5c30e66e033cfd3d46d4693f50fc8f7)
(cherry picked from commit de7e9c83c7503255c512b5c78165ba7924c7269e)