dts: Split dtsi files for Hummingboard
ARM: dts: hummingboard: gpio-ir on gpio 3,5

HummingBoard since rev 2.0 (few developers had it) and the production one
starting rev 3.0 uses gpio 3,5 (EIM_DA5 pad) as the gpio infra red receiver
input.

Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>