arm64: dts: qcom: msm8994-octagon: Configure PON keys

Both the power key and the vol- key are connected over PON.
Configure them.

Signed-off-by: Gustave Monce <gustave.monce@outlook.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210131013853.55810-14-konrad.dybcio@somainline.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>