arm64: dts: qcom: sm8250-sony-xperia: correct GPIO keys wakeup

gpio-keys,wakeup is a deprecated property:

  sm8250-sony-xperia-edo-pdx206.dtb: gpio-keys: key-vol-down: Unevaluated properties are not allowed ('gpio-key,wakeup' was unexpected)

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230304123358.34274-7-krzysztof.kozlowski@linaro.org