When booting for mfgtool, we need to disable DCSS and HDMI since the HDMI
firmware won't be loaded by mfgtool. Add the detect in u-boot and update the
DTB.
Signed-off-by: Ye Li <ye.li@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit 1d01cec0296d56ba8436941864d8da81013e0732)