Add bindings for the PMIC Glink ADC device. This device provides
a mechanism for software to read multiple ADC channels of
Qualcomm Technologies, Inc. PMICs using the Glink interface to
communicate with charger firmware.
Change-Id: I805b13893f80ce993496e35767a89b09ae163254
Signed-off-by: David Collins <quic_collinsd@quicinc.com>