ilo: disable HiZ for misaligned levels

ilo: disable HiZ for misaligned levels

We need to disable HiZ for non-8x4 aligned levels, except for level 0, layer
0.  For the very first layer we can adjust Width and Height fields of
3DSTATE_DEPTH_BUFFER to make it aligned.

Specifically, add ILO_TEXTURE_HIZ and set the flag only for properly aligned
levels.  ilo_texture_can_enable_hiz() is updated to check for the flag.

In tex_layout_validate(), align the depth bo to 8x4 so that we can adjust
Width/Height of 3DSTATE_DEPTH_BUFFER without introducing out-of-bound access.

Finally in rectlist blitter, add the ability to adjust 3DSTATE_DEPTH_BUFFER.