power: reset: replace upstream msm-poweroff driver

This is a snapshot of the msm-poweroff driver as of msm-4.14 commit
<70908b04ed927c2>. (Merge "msm: adsprpc: disable bind/unbind of
fastrpc driver from userspace").

Change-Id: I862d520564ea181e6765f89540bd6c09be1789a8
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>