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

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

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

  meson8-minix-neo-x8.dtb: gpio-leds: 'blue' does not match any of the regexes: '(^led-[0-9a-f]$|led)', 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20221125144120.476933-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>