hwmon: (nct7904) Fix the incorrect value of vsen_mask & tcpu_mask & temp_mode in nct7904_data struct.

Voltage sensors overlap with external temperature sensors. Detect
the multi-function of voltage, thermal diode, thermistor and
reserved from register VT_ADC_MD_REG to set value of vsen_mask &
tcpu_mask & temp_mode in nct7904_data struct. If the value is
reserved, needs to disable the vsen_mask & tcpu_mask.
Signed-off-by: amy.shih <amy.shih@advantech.com.tw>
Link: https://lore.kernel.org/r/20191014082451.2895-1-Amy.Shih@advantech.com.twSigned-off-by: Guenter Roeck <linux@roeck-us.net>