power: regulator: add qcom-rpmh-regulator

Add a regulator driver for controlling the PMIC rails via the RPMh on
Qualcomm platforms. This driver is restricted to only know about rails
which are required by u-boot.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20240617-b4-qcom-rpmh-v1-3-bd2336923e0a@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
3 files changed