ath10k: fix config_enabled check for hwmon

Because of wrong macro check in commit 96bba983 ("ath10k: fix build error
when hwmon is off"), hwmon never be enabled. Fix that.

Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>