tests/kms_3d: Use XRGB8888 instead of ARGB8888
tests/kms_3d: Use XRGB8888 instead of ARGB8888

We don't allow ARGB8888 anymore on primary planes on most platforms,
so use XRGB8888 instead as the format.

Signed-off-by: Ville Syrjälä <cd6e8d405ca90be3a03d5427c5b24fbd2d68dcc4@linux.intel.com>

tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,mv0/intel-gpu-tools,mv0/intel-gpu-tools,mv0/intel-gpu-tools,tiagovignatti/intel-gpu-tools,mv0/intel-gpu-tools,tiagovignatti/intel-gpu-tools