hwmon: qpnp-adc-voltage: Verify channel being read

Add channel verification to check for valid channel being
read from the voltage ADC configuration list.

Change-Id: I2e9fef065088bd4e5b9e3c6715c83c140b5b2555
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
1 file changed