Even though we can't expose textureCompressedBC as the hw doesn't
support all the formats, we can expose as supported individual
formats.

This gets several ~850 CTS tests going from skip to pass, with
patterns like:

  * dEQP-VK.texture.compressed.bc*
  * dEQP-VK.api.copy_and_blit.core.image_to_image.all_formats.color.2d*bc*
  * dEQP-VK.api.copy_and_blit.core.image_to_image.all_formats.color.3d*bc*
  * dEQP-VK.api.info.image_format_properties*bc*
  * etc

v2: BC1-3 formats are texture filterable (Iago)

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <mesa/mesa!8929>