brcm47xx: fix typo in Broadcom-bgmac-b43 profile name

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt@37803 3c298f89-4303-0410-b956-a3cf2f4a3e73