USB: EHCI: add symbolic constants for QHs

This patch (as1568) introduces symbolic constants for some of the
less-frequently used bitfields in the QH structure.  This makes the
code a little easier to read and understand.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/usb/host/ehci-dbg.c
Simple merge

diff --cc drivers/usb/host/ehci-hcd.c
Simple merge

diff --cc drivers/usb/host/ehci-q.c
Simple merge

diff --cc drivers/usb/host/ehci.h
Simple merge