dt-bindings: interrupt-controller: Convert ti,omap-intc-irq to DT schema

Convert the TI OMAP2/3 interrupt controller binding to schema format.
It's a straight-forward conversion of the typical interrupt controller.

"ti,intc-size" property isn't actually used with "ti,omap2-intc", so the
2 bindings can be combined.

Link: https://lore.kernel.org/r/20250505144917.1294150-1-robh@kernel.org


Signed-off-by: Rob Herring (Arm) <robh@kernel.org>