lib80211: Remove unused macro DRV_NAME

There is no caller in tree any more.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20200829115506.17828-1-yuehaibing@huawei.com


Signed-off-by: Johannes Berg <johannes.berg@intel.com>