ARM: dts: Enable UART2 pinctrl on LogicPD Torpedo + Wireless module

Setup UART2 for communication at 3MBps with flow control.

Signed-off-by: Adam Ford <adam.ford@logicpd.com>
[tony@atomide.com: dropped the kim changes, that binding has been removed]
Signed-off-by: Tony Lindgren <tony@atomide.com>