Now that we see warnings if LAYERSERIES_COMPAT is unset, the auto generated
code from devtool/oeqa needs to set this to avoid warnings which break
various tests.
(From OE-Core rev: 27568410ebb0d40db3428550704f35199df0e034)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>