image/packagegroup/populate_sdk: Drop do_populate_sysroot task properly
Setting do_populate_sysroot as noexec means the code keeps thinking it can find
a manifest file for it. It also complicates sstate installtion since the code
would believe there is an sstate object there it should look for.
Instead, delete the task. This causes sdk failures as the dependencies are wrong
so fix those as well.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
