regulator: qcom_spmi: Document PM6125 PMIC

Add support for pm6125 compatible string and add relevant supplies in QCom
SPMI regulator documentation.

Signed-off-by: Adam Skladowski <a39.skl@gmail.com>
Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220802221112.2280686-3-iskren.chernev@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>