Atheros legacy hardware does not perform well on ar71xx unless both TXCFG and RXCFG are forced to 4 bytes.
The previous patch only changed RXCFG. The OpenWrt Madwifi HAL also sets both RXCFG and TXCFG
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17328 3c298f89-4303-0410-b956-a3cf2f4a3e73