[MM][M42 Merge] Fix to add initialization of voice list instance

[MM][M42 Merge] Fix to add initialization of voice list instance

This patch is merged with m42 trunk but didn't migrate to m44.
The step to initialize the voice list is added when TTS starts.

This patch is not necessary for the normal usage.
But when tct-speech-w3c-tests is processed,
the below 6 cases are failed without this.

1. SpeechSynthesisVoice_default_attribute
2. SpeechSynthesisVoice_default_attribute
3. SpeechSynthesisVoice_lang_attribute
4. SpeechSynthesisVoice_localService_attribute
5. SpeechSynthesisVoice_name_attribute
6. SpeechSynthesisVoice_voiceURI_attribute

Original gerrit post : http://165.213.202.130/gerrit/#/c/83931/

Bug : http://web.sec.samsung.net/bugzilla/show_bug.cgi?id=13532

Reviewed by: msu.koo, sm.venugopal, sns.park

Change-Id: If6981f80cd77a289c67ba5ba4d50dcef818b1603
Signed-off-by: yournim.lee <yournim.lee@samsung.com>