regulator: cpr: add snapshot of cpr-regulator driver

This is snapshot of the cpr-regulator driver as of msm-4.14
'commit a1036c1c5f47a ("msm: v4l2loopback: Add v4l2loopback
header entry")'.

Change-Id: I72bb3bb9051e51415f04446b6451ed573468c527
Signed-off-by: Asha Magadi Venkateshamurthy <amagad@codeaurora.org>