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isl: set NullPageCoherencyEnable for depth/stencil sparse surfaces

Lionel Landwerlin requested to merge llandwerlin/mesa:review/anv-sparse-depth-stencil-fix into main

What does this MR do and why?

isl: set NullPageCoherencyEnable for depth/stencil sparse surfaces

Not setting this bits, it seems we get incorrect depth values (i.e
not zero) for null depth/stencil tiles.

Fixes vkd3d-proton's test_sparse_depth_stencil_rendering

CTS doesn´t seem to exercise any depth/stencil format.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: mesa-stable

/cc @pzanoni

Edited by Lionel Landwerlin

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