Dolby Vision Profile 5 files play with pink and purple colors on Android
devices without DV support (#1902): vo=gpu cannot apply DV RPU reshaping,
so the raw IPTPQc2 base layer reaches the screen. The shipped libmpv AAR
builds mpv 0.41 with libplacebo, where gpu-next is the upstream default VO
and reshapes DV correctly.
Prefer vo=gpu-next with an explicit vo=gpu fallback on both the primary
mpv backend and the ExoPlayer failure-fallback path, drop the
vd-lavc-film-grain=cpu override so film grain applies on the GPU under
gpu-next, and report current-vo in player stats.
Verified on a Pixel 7 (no DV display or decoder): gpu-next initializes on
Mali-G710/GLES 3.2, SDR hardware decode is unchanged, and a 4K DV stream
decodes to dolbyvision/bt.2020/pq with correct colors under software
decode. Reshaping still needs software decode: FFmpeg 8.0's mediacodec
wrapper exports no DOVI side data, so hardware-decoded DV keeps playing
the base layer untouched.
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