dev: pmic: Add PM660 POFF read support

Add support to read Power OFF reason status register from
PM660 PON Base for SDM429w target.

Change-Id: I90c3cff28ef838facae5d32eaa0400a36cff6f26
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>
3 files changed