ARM: dts: imx6: RDU2: fix eGalax touchscreen node

Use the correct compatible for the new protocol used by the firmware
on the touch controller, the GPIO wakeup isn't used in that case.
Also eGalax touch needs axis swapping, just as with the RMI4 touch.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>