arm64: dts: qcom: *8350* Consolidate PON/RESIN usage

Disable PON/RESIN keys by default and keep the RESIN keycode set-per-board, as
these settings are not common between devices (one cannot even assume all
devices have buttons nowadays..).

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211114012755.112226-7-konrad.dybcio@somainline.org