ARM: dts: add DTS for Baltos IR5221

This device is an industrial PC based on
AM335x SoC.

[ balbi@ti.com : updated to fit current mainline ]

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>