[webapi] Update 56 designed cases to approved for audio

- Modify tests.full.xml and tests.xml

Impacted tests(approved): new 56, update 0, delete 12
Unit test platform: [IVI] crosswalk-10.38.222, t-e-c 0.107
Unit test result summary: pass 1, fail 24, block 31
Merge pull request #1236 from xinliux/audio-designed

[webapi] Update 56 designed cases to approved for audio