ARM: dts: omap3-igep: Add uart1 and uart2 to igep boards

This is a follow-up to Javier Martinez effort adding initial
device tree support to IGEP technology devices [1].

It adds uart1 and uart2 bindings to the generic dtsi for the IGEP boards.

[1] http://www.spinics.net/lists/linux-omap/msg83409.html



Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Benoit Cousson <benoit.cousson@linaro.org>