tg3: Remove IS_ENABLED(CONFIG_HWMON) check

Commit de0a4148

 added Kconfig logic to
select HWMON and removed all the IS_ENABLED(CONFIG_HWMON) checks in the
tg3.c file. It missed this one check in the header.

Update version to 3.129 and update copyright year.

Signed-off-by: Nithin Nayak Sujir <nsujir@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>