dt-bindings: interrupt-controller: Convert snps,archs-intc to DT schema

Convert the ARC-HS incore interrupt controller binding to schema format.
It's a straight-forward conversion of the typical interrupt controller.

Link: https://lore.kernel.org/r/20250505144834.1292666-1-robh@kernel.org


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