UPSTREAM: xhci: Add bus number to some debug messages

(upstream commit 669bc5a1)

As we register two usb buses for each xHC, and systems with several
hosts are more and more common it is getting hard to follow the
flow of debug messages without knowing which bus they belong to

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>

Bug: 202901721
Signed-off-by: Puma Hsu <pumahsu@google.com>
Change-Id: I55428c864c57e5e10c71ae2e539ca086db31a52d