The dbus-test package is empty, move its dependencies to the ${PN}-ptest
package. Also ensure that it doesn't depend on the empty ${PN} package
which is about to start causing image failures in the following commit.
In this case the correct dependency is dbus itself.
(From OE-Core rev: a2915db76d6a2007b22b20f945498c84e7fa8132)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>