CEC: Make TV try to dispatch the message first

TV sometimes does not wake up after receiving <Image/Text View On> when
connected device starts "One Touch Play" from suspend state.
Since CEC message is not dispatched and just buffered.

This CL changes to dispatch message first and then buffer message if it
fails.

Test: run "One Touch Play" from suspend(standby) state.
Change-Id: I148a0d3373b5b85c8a4d7b858147e7a6e118b7b4