power: smb1355: Add snapshot of driver

Add snapshot of the smb1355-charger driver as of msm-4.14
'commit 7e16ff6c ("defconfig: qcs405: enable WLAN configs
for 32-bit QCS405")'.

Changed use of cancel_work() to cancel_work_sync() as the former has
been made obsolete.

Change-Id: Ie4414b8b36fc29fd0cbe6e7bbee8c45973d2bf05
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>