iwinfo: fix hwmodelist reporting for broadcom wl

Modify the hwmodelist reporting for broadcom devices to include
proper reporting of 802.11n support.

Signed-off-by: Nathan Hintz <nlhintz@hotmail.com>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38745 3c298f89-4303-0410-b956-a3cf2f4a3e73