hwmon: qpnp-adc-current: Export calibration api

Currently calibration is performed every 5 minutes. Provide
an option to the clients to request for IADC re-calibration.

Change-Id: Ia66866610e0702dc25d4235608d123b2e0bf8004
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
2 files changed