xhci: Rename SEGMENT_SIZE and SEGMENT_SHIFT as the former is used in a.out.h

Rename SEGMENT_SIZE and SEGMENT_SHIFT as the former is used in a.out.h.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
cc: linux-usb@vger.kernel.org
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>