Revert "xhci: Refactor interrupter code for initial multi interrupter support."

This reverts commit d2e4da87 which is
commit b17a57f8 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I9c7e6cae478dd1e158afc50bbb80291ef89c11ac
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>