blorp: Don't try to use R32_UNORM for R24_UNORM_X8_TYPELESS rendering.

blorp: Don't try to use R32_UNORM for R24_UNORM_X8_TYPELESS rendering.

The hardware doesn't support rendering to R24_UNORM_X8_TYPELESS, so
Jason decided to fake it with a bit of shader math and R32_UNORM RTs.

The only problem is that R32_UNORM isn't renderable either...so we've
just traded one bad format for another.

This patch makes us use R32_UINT instead.

Fixes: 804856fa5735164cc0733ad0ea62adad39b00ae2 (intel/blorp: Handle more exotic destination formats)
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>