Create a dummy USB gadget for sysfs tests.

VTS has test cases for the sysfs interface around USB gadgets.
As the emulator does not function as a USB gadget, creating a
dummy one is the simplest mechanism to enable the sysfs testing.

Bug: 110558638
Test: run vts -m VtsKernelApiSysfsTest
Change-Id: I87e0d0174bb49b0694ae2704134635d3c3c5ec6c`
1 file changed