soc: qcom: rpmh and cmd-db drivers

Introduce two Qualcomm SoC drivers, the RPMh and cmd-db. RPMh is a the
name for the second generation Resource Power Management hub on Qualcomm
SoCs. Most core regulators have to be controlled via this hub.

The cmd-db is a region of memory which contains offsets and data about
how to communicate with the RPMh.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
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