[M108 Aura Migration] Add media playback ewk api

[M108 Aura Migration] Add media playback ewk api

ewk api:
ewk_view_stop_video
ewk_view_broadcast_decoder_set
ewk_view_media_device_list_get
ewk_settings_default_audio_input_device_set
ewk_view_is_video_playing

Refer:
https://review.tizen.org/gerrit/#/c/270947/
https://review.tizen.org/gerrit/#/c/271619/
https://review.tizen.org/gerrit/#/c/284880/
https://review.tizen.org/gerrit/#/c/284853/
https://review.tizen.org/gerrit/#/c/276711/
https://review.tizen.org/gerrit/#/c/270211/

Change-Id: I406d049dca2b07ae4f4757c6412f0ceff9509e81
Signed-off-by: xiaofang <fang.xiao@samsung.com>