linux-wandboard

MLK-16949: arm64: dtsi: fsl-imx8mq: Reorganize dcss nodes

Currently, the DCSS and HDMI DRM specific nodes are in
fsl-imx8mq-evk.dts file, while the old content of fsl-imx8mq-evk.dts file is in
fsl-imx8mq-evk-fbdev.dts.
Since, this creates confusion., move back the contents of
fsl-imx8mq-evk-fbdev.dts into fsl-imx8mq-evk.dts, and dcss_drm/hdmi_drm
nodes into main file: fsl-imx8mq.dtsi.
Therefore, the fbdev specific files will be derived from
fsl-imx8mq-evk-fbdev.dts, while the main DTS will be based on DRM
drivers which are define in fsl-imx8mq-evk.dts.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>