power: pm8921-bms: periodic hkadc calibration
power: pm8921-bms: periodic hkadc calibration

Introduce periodic hkadc calibration again. A bug was introduced when
periodic ccadc calibration code was moved to the ccadc driver - hkadc
calibration got dropped.

Reintroduce periodic hkadc calibration.

Change-Id: Ib22e03ce881320ca556bfbddd55e658b42363065
Signed-off-by: Abhijeet Dharmapurikar <98996d53ce579fa37f08d0061abc5355e223c79e@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas