dt-bindings: interrupt-controller: Convert technologic,ts4800-irqc to DT schema

Convert the TS-4800 FPGA interrupt controller binding to schema format.
It's a straight-forward conversion of the typical interrupt controller.

Link: https://lore.kernel.org/r/20250505144856.1293370-1-robh@kernel.org


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