arm64: dts: amlogic: correct gpio-keys properties

gpio-keys children do not use unit addresses.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220609113911.380368-6-krzysztof.kozlowski@linaro.org