xhci: Decouple handling an event from checking for unhandled events

xhci: Decouple handling an event from checking for unhandled events

Some sequences, will require traversing through the entire event ring
without handling the event TRB.  This is ideal for when secondary
interrupters that are utilized by external entities need to clean up the
interrupter's event rings during halting of the XHCI HCD.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20240217001017.29969-10-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>