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video: Add NV12_16L32S aka Mediatek MM21 support

Nicolas Dufresne requested to merge ndufresne/gstreamer:mtk-mm21 into main

Unlike other simple tiled formats, the Mediatek HW use different tile size per-plane. The tile size is scaled according to the subsampling. Effectively, using the name 16L32S to represent linearly layout tiles of size 16x32 bytes in the Y plane, and 16x16 in the UV plane. In order to make this specificy discoverrable, a new SUBTILES flags have been added.

cc @dwlsalmeida @benjamin.gaignard

Edited by Nicolas Dufresne

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