gadget: Add gadget template command at libusbg backend
gadget: Add gadget template command at libusbg backend

Change-Id: Ic8835d9f3e84c16c39a26b8f9a2e340b1a4b20d9
Signed-off-by: Pawel Szewczyk <1691dcf8dab804b326e5e4b9ab228a1c3b23a2f2@samsung.com>

kopasiak/gt,kopasiak/gt