Revert "USB: EHCI: work around bug in the Philips ISP1562 controller"

This reverts commit 1996e6c5.

It turned out to not be needed, now that the real fix has been
committed.

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