dt-bindings: timer: Convert cirrus,clps711x-timer to DT schema

Convert the Cirrus CLPS711x timer binding to DT schema format. It's a
straight-forward conversion.

Drop the aliases node and second example which aren't relevant.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250506022215.2586595-1-robh@kernel.org


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