usb: gadget: audio: add super-speed support for uac1 function

In order to allow f_uac1 function driver to operate in
super-speed, additional descriptors are required.
This commit adds the required super-speed specific descriptors.

CRs-fixed: 650715
Change-Id: I1dde1c148db25e004396a110ac84a61e4957e9d5
Signed-off-by: Nadine Toledano <nadinet@codeaurora.org>
Signed-off-by: Bar Weiner <bweiner@codeaurora.org>
Signed-off-by: Ido Shayevitz <idos@codeaurora.org>