MLK-16015-5 drm/imx: ldb: Specify pixel link quirks to be initialization related

This patch specifies the existing pixel link quirks is initialization related.
This may help us distinguish between the pixel link quirks and another one
up-coming which is validation and invalidation related.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
(cherry picked from commit 8433571e)