platform: msm_shared: read power on bit for long press

For long press feature power on reason is checked with key press only.
In case of pmic8950 pon bit is also set along with key press bit. Add the check
to accomodate this condition.

Change-Id: Ia63fb1a254e8c5a99d3b8b413db5fb4b5f4735c4
1 file changed