Revert "xhci: add helper to stop endpoint and wait for completion"

This reverts commit 9affb1d9.

It's not ready to be merged, based on reviews.

Reported-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/96ab6033-2cb9-daa7-ddad-090138896739@linux.intel.com


Cc: Wesley Cheng <quic_wcheng@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>