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turnip: remove extra gmem alignment

Jonathan Marek requested to merge flto/mesa:turnip0 into master

By clearing the "FETCHSIZE" (actually MINPITCH or PITCHALIGN) field when filling GMEM input attachment descriptors, we can get rid of the extra tile width alignment on a630 and a640,

With the block_align_shift value change, this brings down the default gmem_align from 16k to 4k on a630/a640 and down from 24k to 12k on a650, to match the gallium driver.

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