Now that the clock rate is initialized properly and SIFS, EIFS, USEC,
slot time and ACK timeout are properly calculated by the generic code,
the 'async FIFO' register hacks are no longer necessary.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>