UsbGadget: Add specific vendor function composition

New vendor function composition:
diag,serial_cdev,rmnet_gsi,dpl_gsi,qdss

Bug: 141654033
Bug: 141667188
Test: Build pass
Change-Id: Ib2719bb944ee9a7f87ad90c4e6649982a61988fe
Signed-off-by: Kyle Tso <kyletso@google.com>
1 file changed