d2: usb tether: Add new tether_usb_regex string

Need this to be able to tether via usb on 3.4 kernel.

Change-Id: I41a2b4c719a7bc168d4405206228996ec8142779
Merge pull request #4 from CyanogenMod/cm-10.1

d2: usb tether: Add new tether_usb_regex string