With enabled SSTATE_MIRRORS sstate code expects mirrors to
contain entries for all tasks, which is not the case for ext
installer as it uses reduced sstate cache.
Added do_package tasks to BB_SETSCENE_ENFORCE_WHITELIST to prevent
installer failing with ERROR: Sstate artifact unavailable
[YOCTO #10832]
Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
