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anv: Require compression for fast-clears on gfx20+

Nanley Chery requested to merge nchery/mesa:fix/gfx20-aux-assert into main

What does this MR do and why?

anv: Require compression for fast-clears on gfx20+

In commit 44351d67f8f, I needed to change some variables in a check for
compression in anv_can_fast_clear_color_view(). Instead of doing that, I
dropped the check altogether because I thought the call to
anv_layout_to_fast_clear_type() which followed right afterwards would
return ANV_FAST_CLEAR_NONE if the aux usage was ISL_AUX_USAGE_NONE.

That turned out not to be the case, due to special-casing of Xe2+. For
now, make Xe2+ more like other platforms when it comes to enabling
fast-clears. If there comes a reason to actually fast-clear with
ISL_AUX_USAGE_NONE, we can revisit this.

Fixes: 44351d67f8f ("anv: Change params of anv_can_fast_clear_color_view")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11920

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