usb-common.ko was moved to drivers/usb/common starting from kernel 3.16
by upstream commit f4cbd33fd5f0587910fa9db403a1b42f1cabf820
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43290 3c298f89-4303-0410-b956-a3cf2f4a3e73