intel: Change signature of HiZ resolve functions

intel: Change signature of HiZ resolve functions

Now that intel_renderbuffer::region has been replaced with a miptree, the
HiZ functions region parameter must be replaced with a miptree parameter.

Change the return type from bool to void.

Rename the 'depth' parameter to 'layer', because it will correspond to
irb->mt_layer.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>