power: pm8921: Update HTC pm8921 drivers

* HTC kernel version: m7stock_3.4.10-g1a25406

Conflicts:
	drivers/power/pm8921-charger-htc.c
	include/linux/mfd/pm8xxx/pm8921-bms-htc.h
	include/linux/mfd/pm8xxx/pm8921-charger-htc.h

Change-Id: I5b35f54a48b051b7f3b03f0d867b9d14d9ddf8a2