anv: Throw INCOMPATIBLE_DRIVER for non-fatal initialization errors

anv: Throw INCOMPATIBLE_DRIVER for non-fatal initialization errors

The only reason we should throw INITIALIZATION_FAILED is if we have found
useable intel hardware but have failed to bring it up for some reason.
Otherwise, we should just throw INCOMPATIBLE_DRIVER which will turn into
successfully advertising 0 physical devices

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>