codec2: correct include order and add include dir

Include order (according to Android coding style):
1. local includes
2. ported Chromium vda includes
3. codec2 header includes
4. external includes (libchrome)
5. external includes (system, media, framework...)
6. c/c++ header includes

Bug: None
Test: run native tests
Change-Id: I7506cf4561a1df87a1bc8b6324d9419a01035b18
19 files changed