Send trick rate info when playback rate is changed.

Send trick rate info when playback rate is changed.

[Model] SM-Z400F
[BinType] AP
[Customer] OPEN

[Issue#] N/A
[Request] N/A
[Occurrence Version] N/A

[Problem] Although player_set_playback_rate() is getting called, there is no effect in case of external subtitle.
[Cause & Measure] Cause : Changed trick rate info doesn't send to external subtitle pipeline.
Measure : Send the info to external subtitle pipeline.
[Checking Method] player_test > call player_set_playback_rate()

[Team] MM FRAMEWORK
[Developer] JaeChan Lee
[Solution company] Samsung
[Change Type] Specification change

Change-Id: Id63f500cfc5d885895b22e07e887abda879b799f