package: Remove the before do_build constraint of the do_package task
Currently, if you bitbake xxxx, it will restore the package_write_,
packagedata, populate_sysroot *and* the package data from sstate.
We generally care about the packagedata and the actual packages, we
no longer need/care about the do_package data itself unless something
is going to repackage.
By relaxing this constraint (and relying on the packagedata target), we
can save things being installed from sstate and hence speedup build times.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
