regulator: pm8xxx-regulator: add PM8XXX regulator driver

Create a PM8XXX regulator driver that can support PMIC PM8921
variants including: PM8018, PM8038, and PM8921.

Change-Id: I60d1302e4af9a4c5caa72301c904867acd2ebe0f
Signed-off-by: David Collins <collinsd@codeaurora.org>
5 files changed