ARM: dts: imx: Switch to using upstream DT on DH i.MX6 DHCOM

Enable OF_UPSTREAM to use upstream DT and add nxp/imx/ prefix to the
DEFAULT_DEVICE_TREE. And thereby directly build DTB from dts/upstream/src/
including *-u-boot.dtsi files from arch/$(ARCH)/dts/ directory.

Signed-off-by: Marek Vasut <marex@denx.de>
6 files changed