lavu: Add values for various Dolby flags to the AVMatrixEncoding enum.
lavu: Add AV_FRAME_DATA_MATRIXENCODING value to the AVFrameSideDataType enum, which identifies AVMatrixEncoding data.
lavc: add ff_side_data_update_matrix_encoding utility function.
dcadec: set the output channel mode more accurately.

When downmixing 2.1 to 2-channel, if the 2.0 portion is Lt/Rt, sum-difference or dual mono, the actual output will be the same (with the LFE either mixed-in or discarded).

Also, when downmixing an arbitrary layout to 2-channel, if the bitstream contains custom downmix coefficients targeting Lt/Rt, then the output will be Lt/Rt rather than regular Stereo.
dcadec: set AV_FRAME_DATA_MATRIXENCODING side data.