intel/blorp: Add a CCS ambiguation pass

This pass performs an "ambiguate" operation on a CCS-compressed surface
by manually writing zeros into the CCS.  On gen8+, ISL gives us a fairly
detailed notion of how the CCS is laid out so this is fairly simple to
do.  On gen7, the CCS tiling is quite crazy but that isn't an issue
because we can only do CCS on single-slice images so we can just blast
over the entire CCS buffer if we want to.

Reviewed-by: Topi Pohjolainen <[email protected]>
Reviewed-by: Nanley Chery <[email protected]>

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