linux-imx

serdev: ttyport: release tty lock sooner on open

Release the tty lock once tty-driver open returns to make it clear that
it does not protect neither tty->termios or the serport flags.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>