msm: rpm-regulator: add RPM regulator support for MSM8930

MSM8930 boards utilize the new PMIC PM8038.  Add a new
rpm-regulator data file which defines all of the regulators
available via the RPM for MSM8930 boards.

The regulator definitions describe both the physical properties of
the regulators and the RPM interface format used for each type of
regulator.

Change-Id: If4bdbaf3f6d22b905bf7334d681410fcddff9b7b
Signed-off-by: David Collins <collinsd@codeaurora.org>