regulator: cpr-regulator: Add CPR de-aging support

CPR aging sensors detect the performance degradation
resulting from silicon aging. The CPR de-aging algorithm
detects the aging degradation of the device by reading
aging sensor data and generating necessary voltage guard band
to maintain SoC performance. Limit the generated voltage
guard band to a pre-defined threshold.

Change-Id: Iea6123c1b42856bb123d3e1c79f60401882aa8ba
Signed-off-by: Ravindranath Thiyagarajan <rthiyaga@codeaurora.org>
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>