BACKPORT: FROMGIT: usb: gadget: f_uac2: Populate SS descriptors' wBytesPerInterval

For Isochronous endpoints, the SS companion descriptor's
wBytesPerInterval field is required to reserve bus time in order
to transmit the required payload during the service interval.
If left at 0, the UAC2 function is unable to transact data on its
playback or capture endpoints in SuperSpeed mode.

Since f_uac2 currently does not support any bursting this value can
be exactly equal to the calculated wMaxPacketSize.

Tested with Windows 10 as a host.

Fixes: f8cb3d55 ("usb: f_uac2: adds support for SS and SSP")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Link: https://lore.kernel.org/r/20210909174811.12534-3-jackp@codeaurora.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 199044440
Change-Id: Ibf183102d577aa02746822d145d63a1c767557d2
(cherry picked from commit f0e8a206
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git

 usb-linus)
[jackp: Resolved merge conflict in f_uac2.c due to added code in upstream]
Signed-off-by: Jack Pham <jackp@codeaurora.org>