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etnaviv: Emit PE.ALPHA_COLOR_EXT* on GC3000 and newer

Marek Vasut requested to merge marex/mesa:mx6q-gc2000-fixes-r2 into master

At least GC880 (iMX6S), GC2000 (iMX6Q) blobs do not emit the PE.ALPHA_COLOR_EXT0 and PE.ALPHA_COLOR_EXT1 into the command stream. Do not emit them in etnaviv either.

This fixes all of the currently failing dEQPs in this group: dEQP-GLES2.functional.fragment_ops.blend.*

The GCnano (STM32MP1) is not affected by this change, hence we can likely assume this is needed since certain HALTI level, however it is not clear whether using HALTI2+ here is the right choice.

Signed-off-by: Marek Vasut marex@denx.de

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