USB: removal of tty->low_latency hack dating back to the old serial code

commit 2400a2bfbd0e912193fe3b077f492d4980141813 upstream

[ cebbert@redhat.com: backport to 2.6.27 ]

USB: removal of tty->low_latency hack dating back to the old serial code

This removes tty->low_latency from all USB serial drivers that push
data into the tty layer at hard interrupt context. It's no longer needed
and actually harmful.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>