hwmon: Fix parameter documentation

sparse reports:

drivers/hwmon/hwmon.c:681: warning:
	No description found for parameter 'chip'
drivers/hwmon/hwmon.c:681: warning:
	Excess function parameter 'info' description in
	'hwmon_device_register_with_info'
drivers/hwmon/hwmon.c:789: warning:
	No description found for parameter 'chip'
drivers/hwmon/hwmon.c:789: warning:
	No description found for parameter 'groups'
drivers/hwmon/hwmon.c:789: warning:
	Excess function parameter 'info' description in
	'devm_hwmon_device_register_with_info'

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