ARM: dts: amlogic: meson8b-ec100: align GPIO keys node name with bindings

ARM: dts: amlogic: meson8b-ec100: align GPIO keys node name with bindings

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

  meson8b-ec100.dtb: gpio-keys: '#address-cells', '#size-cells' do not match any of the regexes: '^(button|event|key|switch|(button|event|key|switch)...

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240701165210.578817-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>