ARM: dts: qcom: msm8974-samsung-klte: move gpio-keys out of soc

The GPIO keys are not part of SoC and they should be defined inside of
the root node.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220401201035.189106-6-krzysztof.kozlowski@linaro.org