hwmon: (atxp1) Drop auto-detection

Auto-detection for this chip is highly unreliable, and one of its
I2C addresses can also be used by EEPROMs, increasing the risk for
false positives even more. Drop auto-detection entirely to remove
the risk.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>