intel/blorp_clear: Add gen8 HiZ clearing functions
Add an entry point for the optimized gen8 BLORP HiZ sequence. commit
c9eaf12de20ac4143fe79d42018bdbb5a391356f fixed a bug that was
unknowingly worked around by forcing additional clear rectangle
alignment restrictions not specified in the PRMs. Now that the bug is no
longer present, omit the additional alignment restrictions.
v2: Adjust code comment about padding
Signed-off-by: Nanley Chery <nanley.g.chery@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>