CHROMIUM: config: Add necessary kernel modules for ADB over USB

This change builds the necessary modules so that a USB gadget that can
be configured through FunctionFS/ConfigFS to act as an ADB server can
start.

CQ-DEPEND=CL:974281
BUG=b:69686268
TEST=`adb devices` works after loading the needed modules
Signed-off-by: Luis Hctor Chvez <lhchavez@chromium.org>

Change-Id: I340402f043fc56a6989069a8eabb17a4aebe1fca
Reviewed-on: https://chromium-review.googlesource.com/974370
Commit-Ready: Luis Hector Chavez <lhchavez@chromium.org>
Tested-by: Luis Hector Chavez <lhchavez@chromium.org>
Reviewed-by: Luis Hector Chavez <lhchavez@chromium.org>