ARM: dts: imx6qdl-gw552x: add USB OTG support

The GW552x-B board revision adds USB OTG support.

Enable the device-tree node and configure the OTG_ID pin.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>