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Sony ever so graciously provides GPIO line names in their downstream
kernel (though sometimes they are not 100% accurate and you can judge
that by simply looking at them and with what drivers they are used).

Add these to the PDX203&206 DTSIs to better document the hardware.

Diff between 203 and 206:
pm8009_gpios
<                         "CAM_PWR_LD_EN",
>                         "NC",

pm8150_gpios
<                         "NC",
>                         "G_ASSIST_N",
<                         "WLC_EN_N", /* GPIO_10 */
>                         "NC", /* GPIO_10 */
Which is due to 5 II having an additional Google Assistant hardware
button and 1 II having a wireless charger & different camera wiring
to accommodate the additional 3D iToF sensor.
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230614-topic-edo_pinsgpiopmic-v2-2-6f90bba54c53@linaro.org

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