regulator: qcom,smd: Document PMR735a

PMR735a also appears to be bundled with some SMD RPM SoCs.
Document it.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221109110846.45789-1-konrad.dybcio@linaro.org


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