When mpv bitstreams (audio-spdif), audio-params describe the IEC 61937
carrier - 192 kHz "stereo" for E-AC-3 - so the performance overlay told
users their 5.1 track was playing as 2ch stereo. Every recent "EAC3
downgraded to PCM" report in #1300 reads back this string while the
receiver route stays healthy.
Show the source track's channel layout and sample rate instead, plus an
explicit Passthrough row naming the bitstreamed codec, on both the
mpv-channel and Android mpv-fallback stats paths.
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