Include memento_softwareupdate in make_factory_toolkit.sh

Battery cutoff code are shared in memento_softwareupdate. We need to
include it when building factory toolkit.

BUG=chromium:544021
TEST=Build and test factory toolkit on Samus

Change-Id: I1d8e0239bcf4987a9f467b1f5f3320d3ba9b3570
Reviewed-on: https://chromium-review.googlesource.com/306550
Commit-Ready: Shun-Hsing Ou <shunhsingou@chromium.org>
Tested-by: Shun-Hsing Ou <shunhsingou@chromium.org>
Reviewed-by: Bowgo Tsai <bowgotsai@chromium.org>
(cherry picked from commit fe0647a3cce55675060bd6809f465e1cb1c001e2)
Reviewed-on: https://chromium-review.googlesource.com/333890
Reviewed-by: Bowgo Tsai <bowgotsai@google.com>
Commit-Queue: Loop Wu <Loop_Wu@asus.com>
Tested-by: Loop Wu <Loop_Wu@asus.com>
diff --git a/make_factory_toolkit.sh b/make_factory_toolkit.sh
index 3fc56e1..80d6fe4 100755
--- a/make_factory_toolkit.sh
+++ b/make_factory_toolkit.sh
@@ -60,7 +60,8 @@
 
   export INSTALL_MASK="${FACTORY_TEST_INSTALL_MASK}"
   emerge-${FLAGS_board} --root="${temp_pack_root}" --nodeps --usepkgonly -v \
-    chromeos-factory chromeos-factory-board autotest-factory-install
+    chromeos-factory chromeos-factory-board autotest-factory-install \
+    memento_softwareupdate
 
   local factory_repo="${CHROOT_TRUNK_DIR}/src/platform/factory"
   local repo_status_script="${factory_repo}/py/toolkit/print_repo_status.py"