gs101: usb: remove flag "OLDER_GADGET"

The flag "OLDER_GADGET" is no need.
Using "11110000.dwc3" be the udc name.

Test: Build Pass and boot to home
Bug: 177879761
Signed-off-by: Ricky Niu <rickyniu@google.com>
Change-Id: I43c9e2815a6384c4dffdc47312fa0f372b34d9e9
7 files changed