regulator: qcom-rpmh: Add new regulator found on SA8155p adp board

regulator: qcom-rpmh: Add new regulator found on SA8155p adp board

SA8155p-adp board supports a new regulator - pmm8155au.

The output power management circuits in this regulator include:
- FTS510 smps,
- HFS510 smps, and
- LDO510 linear regulators

Add support for the same.

Cc: Mark Brown <broonie@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210617051712.345372-6-bhupesh.sharma@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>