usb: gadget: f_uvc: Correct SS Companion descriptors

The current calculation of maxpacket size and mult
causes more data to be send that intended in a frame
interval. Fix this by setting the maxpacket size
to 1024 and control the data need to send in
an interval by using maxburst.

Change-Id: I1905e3955822a838272e48bf72f6907e9cbd477f
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>