hwmon: (adm1021) Improve detection of LM84, MAX1617, and MAX1617A

The adm1021 driver is quite generous with its automatic chip detection
and easily misdetects several chips. Strengthen detection of MAX1617,
MAX1617A, and LM84 to make the driver less vulnerable to false matches.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>