adbd: enable USB SuperSpeed (again)

The descriptors to enable USB 3.0 SuperSpeed support had previously
been added in commit d6ee9f26
but were removed when the v1/v2 descriptor handling was refactored
in commits ab3446dd and again in
c49f51c4. Now that the dust has
settled, add back the SS descriptors to re-enable USB 3.0.

Change-Id: I8de7c7e50d9216a7492ce7863e3aaf92ff805eff