arm64: dts: mediatek: mt7622-bananapi-bpi-r64: align led node names with dtschema

The node names should be generic and DT schema expects certain pattern
with 'led'.  Use generic color properties instead of the node name.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220616005333.18491-16-krzysztof.kozlowski@linaro.org


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