We've realised that "bitbake XXXx -c populate_sdk" doesn't actually trigger
the package_qa tests to run. This means test coverage on the autobuilder was
poor. Fix this and run the tests for SDKs.
(From OE-Core rev: f35d9b7cc3998c88743397c5dc7e60dac8e4bbea)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>