stagefright: Fix the input channel count

Change-Id: Ib59e0c9d4ed319a1c23177dcb54dc82d32eb8992
libstagefright: Don't invoke FFMPEG for MP3

Change-Id: Ia30d25d1a994328827f14a286661cd2e1eaa1181
Merge pull request #2 from SlimRoms/kk4.4

update