TTY: ami_serial, remove BTM from wait_until_sent

The same as in "TTY: serial, remove BTM from wait_until_sent" we don't
need to take BTM in wait_until_sent of ami_serial. Exactly the same
as serial, ami_serial accesses some "info" members (xmit_fifo_size,
timeout), but their assignment on other places in the code is not
protected by BTM anyway.

So the BTM protects nothing here. This removal helps us to get rid of
tty_locked() and __big_tty_mutex_owner in the following patch. This
was suggested by Arnd.

Signed-off-by: Jiri Slaby <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Andreas Bombe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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