MLK-19017-2 gpu: imx: add DISPMIX power domain support for LCDIF

MLK-19017-2 gpu: imx: add DISPMIX power domain support for LCDIF

After the DISPMIX power domain enabled, all the related registers
will drop their values once runtime pm suspend called. So in the
pm runtime resume process, the LCDIF de-reset and some init jobs
need to be done, and these jobs are no longer necessary to be done
during probe stage anymore.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>
(cherry picked from commit f83aaaecaeb54d8b1231be2cb7175ce58682dae7)
(cherry picked from commit aa6a8be1f5e5107d02e58e4091e666a2d8fbfcc6)