radv: Handle UNDEFINED format in image format list.

radv: Handle UNDEFINED format in image format list.

Was watching a presentation on YT where this was used and it turns
out it is not invalid.

The only case it is actually valid as format in the creation of an
image or image view is with Android Hardware Buffers which have
their format specified externally.

So we can just ignore all entries with VK_FORMAT_UNDEFINED.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>