ath9k: increase ANI poll interval to 300 ms to get it close to the listen period

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

git-svn-id: svn://svn.openwrt.org/openwrt@36823 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: improve AP mode powersave buffering handling

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

git-svn-id: svn://svn.openwrt.org/openwrt@36824 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: prevent excessive buffered multicast traffic from drowning out regular traffic

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

git-svn-id: svn://svn.openwrt.org/openwrt@36825 3c298f89-4303-0410-b956-a3cf2f4a3e73