tests/prime_nv_pcopy: Use asserts in setup code
tests/prime_nv_pcopy: Use asserts in setup code

Now we even have more fine-grained checking and only skip if the
nouveau card isn't supported, but fail properly if something else goes
wrong.

Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

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