On slower devices wifi drivers might take too long for detecting
devices, resulting in the wifi detect call not seeing them.
This was observed on a bcm6348 with bcm4318 wifi. Adding a one second
pause was enough for b43 to expose the device.
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31639 3c298f89-4303-0410-b956-a3cf2f4a3e73