Revert "rtl8180: use NAPI for bottom-half processing"

This reverts commit 030725d2c7c1fafec7ede618647bf30ed79601f0.

This commit relies on commit 5ed3bc7288487bd4f891f420a07319e0b538b4fe
("mac80211: use netif_receive_skb in ieee80211_tx_status callpath")
Unfortunately not all drivers are calling ieee80211_tx_status from a
compatible context, so that commit needs to be reverted in 2.6.36.

Signed-off-by: John W. Linville <linville@tuxdriver.com>