arm64: dts: mediatek: align LED node names with dtschema

The node names should be generic and DT schema expects certain pattern:

  mediatek/mt8183-kukui-jacuzzi-fennel-sku1.dtb: pwmleds: 'keyboard-backlight' does not match any of the regexes: '^led(-[0-9a-f]+)?$', 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221125144138.477198-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>