usbmode: update to latest git

this adds support for a new mode MBIM that auto detects the bConfigurationValue.

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42298 3c298f89-4303-0410-b956-a3cf2f4a3e73