relnotes: Add new ext on etnaviv for 19.2.
Ext was added with this commit: https://cgit.freedesktop.org/mesa/mesa/commit/?id=8dd26fa2f065e78f3204357d8b474656b9ea81db
Edited by Christian Gmeiner
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Ext was added with this commit: https://cgit.freedesktop.org/mesa/mesa/commit/?id=8dd26fa2f065e78f3204357d8b474656b9ea81db