anv: Update the HiZ sampling helper

Validate the inputs, verify that this image has a depth
buffer, use gen_device_info instead of

v2:
- Add parenthesis (Jason Ekstrand)
- Make parameters const
- Use gen_device_info instead of gen
- Pass aspect to missed function in transition_depth_buffer

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