Kevin Chuang 87ff7b061f anv/bvh: Fix copy shader handling sparse buffer
Fixes: 692b5fa9f2 ("anv: Add shader to copy acceleration structures")

This commit fixes the future test "sparse_binding_structures" for
"header_bottom_address" for ray tracing pipeline.

Even on 48-bit ray tracing (Xe1/2), the software-defined part
instance_leaf_part1.bvh_ptr has to be in canonical form for copy.comp
to deference a bvh, which means we have to preserve the upper 16bits.
This is especially relevant in cases where the acceleration structure buffer
is located high, such as sparse buffer.

Signed-off-by: Kevin Chuang <kaiwenjon23@gmail.com>
Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33745>
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