Many different ptests are breaking as they assume that ${PN}-ptest
depends on ${PN}. It doesn't currently but should. If we fix this, many
different ptests start passing when they previously failed.
It does depend on fixing an issue in the dbus-test recipe which is done
in the preceeding patch (mentioned in case this gets backported).
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>