rt2x00: uncomment get_tsf

The atomic requirement for get_tsf() has been removed
by mac80211. This means the USB drivers can add support
for the callback function again.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
1 file changed