mac80211: add another minstrel_ht performance improvement

git-svn-id: svn://svn.openwrt.org/openwrt@35890 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: enable building ramdisk images for WZRHPG30XNH board types

Backport of r35874.

git-svn-id: svn://svn.openwrt.org/openwrt@35891 3c298f89-4303-0410-b956-a3cf2f4a3e73