igt/gem_mmap_wc/set-cache-level: Exercise set-cache-level WARNing
igt/gem_mmap_wc/set-cache-level: Exercise set-cache-level WARNing

With the introduction of mmap(wc) and its unbound GTT write domain, we
can now hit the warning inside set-cache-level, complaining about the
failure to do correct cpu cache tracking.

Signed-off-by: Chris Wilson <711c73f64afdce07b7e38039a96d2224209e9a6c@chris-wilson.co.uk>

dlespiau/checkmate-test-igt,chenxianqin/intel-gpu-tools,tiagovignatti/intel-gpu-tools,yipdw/intel-gpu-tools,chenxianqin/intel-gpu-tools,yipdw/intel-gpu-tools,mv0/intel-gpu-tools,chenxianqin/intel-gpu-tools,erikarn/intel-gpu-tools,yipdw/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,mv0/intel-gpu-tools,dlespiau/checkmate-test-igt,erikarn/intel-gpu-tools,tiagovignatti/intel-gpu-tools,chenxianqin/intel-gpu-tools,dlespiau/checkmate-test-igt,erikarn/intel-gpu-tools,yipdw/intel-gpu-tools,mv0/intel-gpu-tools,dlespiau/checkmate-test-igt,mv0/intel-gpu-tools,erikarn/intel-gpu-tools