anv: Only enable EWA LOD algorithm when doing anisotropic filtering.

Kenneth Graunke requested to merge kwg/mesa:anv-ewa into master

Updated documentation renames "Anisotropic Algorithm" to "LOD Algorithm" and adds a note for Gen9+ saying "The EWA Algorithm should only be enabled for Anisotropic Filtering modes." and indicating that the extra accuracy shouldn't be necessary for other modes, and comes at a cost.

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