anv: Replace anv_image_has_hiz() with ISL_AUX_USAGE_HIZ

The helper doesn't provide additional functionality over the current
infrastructure.

v2: Add comment to anv_image::aux_usage (Jason Ekstrand)
v3: Clarify comment for aux_usage (Jason Ekstrand)

Signed-off-by: Nanley Chery <nanley.g.chery@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
5 files changed