USB: f_accessory: Add super speed descriptors with accessory function

Update accessory function driver to operate in super speed. The burst
capability is not enabled for now.

Change-Id: Ie95cbfc9444c56c8268b70e2916713190699c71a
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>