ARM: dts: dove: align LED node names with dtschema

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

  dove-cubox.dtb: leds: 'power' does not match any of the regexes: '(^led-[0-9a-f]$|led)', 'pinctrl-[0-9]+'

Link: https://lore.kernel.org/r/20221125144125.477032-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>