The ASUS WL-520gU and some other similar Asus devices have a BCM5354 running at 200MHZ and not at 240 which is the default for this SoC. This fixes #4083. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34325 3c298f89-4303-0410-b956-a3cf2f4a3e73