If format doesn't support bits we want, return unsupported. Closes #1098

* The only formats the spec requires are for optimalTiledFeatures and already
  requires all the usage bits we are going to enable ourselves. The only cases
  where we can get in trouble is for formats that support a subset of those
  features e.g. on linear tiled images.
* So we can safely remove the reported support for those formats and still be
  compliant. The application must then work with that lack of support the same
  way as it would do if the ICD itself didn't have that support.