ARM: dts: vf610-twr: Add ttyLP2 device.

The ttyLP1 is already the default console/serial port.  The
tower board will route ttyLP2 to the same connectors depending
on the JP23/24 settings.

See:
 http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/276457.html
 http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/275576.html



Signed-off-by: Bill Pringlemeir <bpringlemeir@nbsps.com>
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>