libmix: port WMV related patch

BZ:47670

original patch:
51112:libstagefright: Fix an issue that thumbnail for WMV file can not be generated
42039: libstagefright: Ignore seek in case of no index object within asf file
30078:libstagefright: Porting patches from R2 to R3
Signed-off-by: ywan171 <yi.a.wang@intel.com>

Change-Id: I13ccf6d9c4194bf74dc6f708a9a5a18f83e8d4bd
Reviewed-on: http://android.intel.com:8080/58297
Reviewed-by: Feng, Wei <wei.feng@intel.com>
Reviewed-by: Zhang, Xiaolin <xiaolin.zhang@intel.com>
Tested-by: Zhang, Xiaolin <xiaolin.zhang@intel.com>
7 files changed