ath9k: merge a fix for ar9550 eeprom access

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36858 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: fix a regression in the powersave handling related changes

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36859 3c298f89-4303-0410-b956-a3cf2f4a3e73