FROMGIT: xhci: sideband: add api to trace sideband usage

The existing sideband driver only registers sidebands without tracking
their active usage. To address this, sideband will now record its active
usage when it creates/removes interrupters. In addition, a new api is
introduced to provide a means for other dirvers to fetch sideband
activity information on a USB host controller.

Signed-off-by: Guan-Yu Lin <guanyulin@google.com>
Link: https://lore.kernel.org/r/20250911142051.90822-4-guanyulin@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250911142051.90822-4-guanyulin@google.com

Bug: 332543320
(cherry picked from commit ef82a480
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/

 usb-next)

Change-Id: Iee39df04475b84ea0dff04e1d622e3f70707cb42
Signed-off-by: Guan-Yu Lin <guanyulin@google.com>