rm_work: Speed up rootfs/populate_sdk removal
Commands like bitbake X -c rootfs or bitbake X -c populate_sdk do not
trigger rm_work to clean up the directories afterwards since it
traditionally hooks onto do_build. This change means those two tasks now
clean up after themselves. We use the cleandirs function attribute to
handle this.
[YOCTO #6413]
(From OE-Core rev:
6bf06d80c2ce03dfdedac5ad8cf42ef8e36b0ecb)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
