arm64: dts: qcom: Use plural _gpios node label for PMIC gpios

The gpio node in PMIC dts'es define access to multiple GPIOs.  Most Qcom
PMICs were already using the plural _gpios label to point to this node,
but a few PMICs were left behind including the recently-pulled
pm(i)8950.

Rename it from *_gpio to *_gpios for pm6125, pm6150(l), pm8005,
pm(i)8950, and pm(i)8998.

Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Acked-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221209220450.1793421-1-marijn.suijten@somainline.org