drivers: add a snapshot of various QPNP PMIC peripheral drivers

Add a snapshot of several Qualcomm Technologies, Inc. QPNP PMIC
peripheral drivers.  These drivers manage various modules found
within PMIC chips.

This snapshot is taken as of msm-4.4
commit d24550bbf50f ("Merge "ARM: dts: msm: Add slimbus slave
device for wcn3990 on sdm630"").

Change-Id: I842f81737eec1ca11bf31534e9299bd7a6511f6c
Signed-off-by: David Collins <collinsd@codeaurora.org>