ath9k: improve multicast buffering handling, take care of the MORE_DATA flag properly

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36880 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: fix paprd descriptor setup

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36881 3c298f89-4303-0410-b956-a3cf2f4a3e73