Manifest class clients don't really need to know how package types are
encoded.
(From OE-Core rev: bac2e279005b601daff4d53549612ceb76a6a857)
Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>