ARM: dts: Add missing reg, interrupt and dma entries for omap3

Looks like omap3 is still relying on hwmod data for some basic
device tree information. Let's add the information to omap3.dtsi
so we can remove the related hwmod data once omap3 is DT only.

Acked-by: Benoit Cousson <bcousson@baylibre.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>