lttng-ust: update to 2.11.1
Update to latest available.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexander Kanavin <alex.kanavin@gmail.com>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>