Eleven: properly send open/close session events

These were being fired off at device boot and there was a session being
held for the entire duration. Only request the session when playing.

Change-Id: I37ebc5a6898453dd090cc68ee2126e9c5d08d892
Signed-off-by: Roman Birg <roman@cyngn.com>
(cherry picked from commit 914b9d7a)