i965/Gen8: Set up layer constraints properly for depth buffers

Same issues as the previous commit fixed for Gen7:
- Bogus physical->logical layer conversion; depth/stencil surfaces
  are still IMS layout on Gen8.
- mt_layer ignored in layered rendering case, which breaks handling
  of views with MinLayer.
- Render target array extent not set correctly for arrays.

I'm not able to test this one since I can't get a Broadwell yet, but
it's the same set of fixes as for Gen7.

V2: Restore the MAX2() to account for zero depth/layer_count.

Signed-off-by: Chris Forbes <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

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