Allow 15 byte headtracker SDU for early implementations
Early drafts of DSA 2.0 specification had 15 byte allocation for headtracker data over LE-ISO. This was later changed to 13 bytes. However some early adopters of DSA 2.0 may expect an allocation of 15 bytes for headtracker data. Early drafts of DSA 2.0 specification also didn't have metadata for Android Headtracker Codec. This can be used to distinguish between earbuds which support early and those which support approved DSA 2.0 specification. Test: mmm packages/modules/Bluetooth Test: Manual | Test DSA 2.0 with all supporting earbuds Flag: com.android.bluetooth.flags.headtracker_sdu_size Bug: 349901879 Bug: 350090733 Change-Id: If70046cd801a95d3b628450ba223ffe5010ffc3e
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