Revert "arm: exynos: add support for odroid-xu3 board"

This reverts commit 13bd0a80519a6185825a20954b03763c7f74f6f5.
ARM: dts: Explicitly set dr_mode on exynos Peach boards

In case the optional dr_mode property isn't set in the dwc3 nodes the
the controller will go into OTG mode if both USB host and USB gadget
functionality are enabled in the kernel configuration. Unfortunately
this results in USB not working on exynos5420-peach-pit and
exynos5800-peach-pi with such a kernel configuration unless manually
change the mode. To resolve that explicitly configure the dual role
mode as host.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Andreas Faerber <afaerber@suse.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
ARM: dts: Add dts file for odroid XU3 board

Add DTS for the Hardkernel Odroid XU3. The name of the DTS file is kept the
same as the vendors naming, which means it's prefixed with exynos5422
instead of exynos5800 as the SoC name even though it includes the
exyno5800 dtsi.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>