Tama has four GPIO-wired keys: two for camera focus and shutter /
snapshot, and two more for volume up and down.  As per the comment these
used to not work because the necessary pin bias was missing, which is
now set via pinctrl on pm8998_gpios.

The missing bias has also been added to the existing volume down button,
which receives a node name and label cleanup at the same time to be more
consistent with other DTS and the newly added buttons.  Its deprecated
gpio-key,wakeup property has also been replaced with wakeup-source.

Note that volume up is also available through the usual PON RESIN node,
but unlike other platforms only triggers when the power button is held
down at the same time making it unsuitable to serve as KEY_VOLUMEUP.

Fixes: 30a7f99b ("arm64: dts: qcom: Add support for SONY Xperia XZ2 / XZ2C / XZ3 (Tama platform)")
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230109234133.365644-1-marijn.suijten@somainline.org