dt-bindings: timer: Convert ezchip,nps400-timer to DT schema

Convert the EZChip NPS400 Timer bindings to DT schema format. It's a
straight-forward conversion. The 2 bindings only differ in compatible
and one required property, so the schemas can be combined.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250506022237.2587355-1-robh@kernel.org


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>