stagefright: Enhance MPEG4 writer/extractor to store/retrieve layer info
Store temporal layer-count in MP4 meta-keys. Enhance MPEG4Extractor to parse layer-count and make it available in file-meta. For AVC, parse SVC-extension NALs (if available), to extract the layer-id and make it avialble in buffer-meta. Bug: 27596987 Change-Id: I84a8914b470a0aadec0e02692296b1915a6c776e (cherry picked from commit 09c8bb3d3b01d213fb845cd9c24c5e18443d7626)
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