hwmon: qpnp-adc: Update temperature to voltage table

Update the temperature units in the translation table
used to map voltage to temperature and vice versa.
Thermal zone prefers units to be in units of millidegC.
Therefore update the temperature units in the table
to provide the output of the voltage to temperature
translation in units of millidegC.

Change-Id: Ida2e2ec49f2e482d506d082ead2cd989bae4a802
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>