Revert "drm/bridge: imx: Add LDB support for i.MX8qxp"

commit 6afdfbc8367babd86c8c1007872a7e089c55f6cc from
https://github.com/nxp-imx/linux-imx



As our downstream i.MX8qxp LDB encoder driver module name conflicts with
the upstream i.MX8qxp LDB bridge driver module name, revert the upstream
driver for now to avoid build break.

This reverts commit 3818715f.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>