intel: Minimal calculation of pixel hash table for arbitrary number of pixel pipes.

intel: Minimal calculation of pixel hash table for arbitrary number of pixel pipes.

This starts off with the simplest possible pixel hashing table
calculation that just assigns consecutive indices (modulo N) to
adjacent entries of the table, along the lines of the existing
intel_compute_pixel_hash_table().  The same function will be improved
in a future commit with a more optimal calculation.

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13569>