power: pm8921-charger: vote D0 when running kickstart

There is a small window when the PMIC could lock up while
running the kickstart routine. If PMIC sleeps right while
kickstart is run, it causes a short sleep which is known
to cause PMIC locksup.

To prevent these, specifically vote for D0 clock while
running kickstart which guarantees that the PMIC will not
sleep.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>

Conflicts:
	drivers/power/pm8921-charger.c

Change-Id: I830749c19c79fd63238769ecf7472d03d67e7aa2