freedreno/a6xx: Limit MSAA clear fallback
It is only the sysmem CP_BLIT path that doesn't really cope well with MSAA clears, but we can still do GMEM. Helps things like webgl aquarium not fall off the LRZ path.
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It is only the sysmem CP_BLIT path that doesn't really cope well with MSAA clears, but we can still do GMEM. Helps things like webgl aquarium not fall off the LRZ path.