ARM: dts: nuvoton: wpcm450: align LED and GPIO keys node name with bindings

ARM: dts: nuvoton: wpcm450: align LED and GPIO keys node name with bindings

Bindings expect the LED and GPIO keys node names to follow certain
pattern, see dtbs_check warnings:

  nuvoton-wpcm450-supermicro-x9sci-ln4f.dtb: gpio-keys: 'uid' does not match any of the regexes: '^(button|event|key|switch|(button|event|key|switch)...

Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20240701164915.577068-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>