CHERRY-PICK:Banjo: Remove at-shutdown option

Since EC doesn't support 'at-shutdown' option,
remove it for PVT build.

BUG=chrome-os-partner:39324
TEST=mamually verify 'ectool batterycutoff'

Original Change-Id: I0e5f47e74c6cb24e4ce054e1b79b46533213a039
Signed-off-by: Jeremy P Lin <jeremy.p.lin@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/266259
Reviewed-by: Bowgo Tsai <bowgotsai@chromium.org>
(cherry picked from commit 182eb3474ef7e9c5ad70f67a8faab74f4529286b)

Change-Id: Ib4bb927bbc4362b091db65a7d103c73718557068
Reviewed-on: https://chromium-review.googlesource.com/266624
Reviewed-by: Jeremy P Lin <jeremy.p.lin@intel.com>
Tested-by: Jeremy P Lin <jeremy.p.lin@intel.com>
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
Commit-Queue: Bernie Thompson <bhthompson@chromium.org>
diff --git a/overlay-banjo/chromeos-base/chromeos-bsp-banjo/chromeos-bsp-banjo-0.0.1-r5.ebuild b/overlay-banjo/chromeos-base/chromeos-bsp-banjo/chromeos-bsp-banjo-0.0.1-r5.ebuild
new file mode 120000
index 0000000..f2feec7
--- /dev/null
+++ b/overlay-banjo/chromeos-base/chromeos-bsp-banjo/chromeos-bsp-banjo-0.0.1-r5.ebuild
@@ -0,0 +1 @@
+chromeos-bsp-banjo-0.0.1.ebuild
\ No newline at end of file
diff --git a/overlay-banjo/chromeos-base/chromeos-bsp-banjo/files/sbin/battery_cut_off.sh b/overlay-banjo/chromeos-base/chromeos-bsp-banjo/files/sbin/battery_cut_off.sh
index 1e2b6c3..608ca8b 100755
--- a/overlay-banjo/chromeos-base/chromeos-bsp-banjo/files/sbin/battery_cut_off.sh
+++ b/overlay-banjo/chromeos-base/chromeos-bsp-banjo/files/sbin/battery_cut_off.sh
@@ -33,8 +33,7 @@
   echo "===============================================" >"$TTY"
 fi
 
-ectool batterycutoff at-shutdown
-shutdown -h now
+ectool batterycutoff
 sleep 15
 
 # Couldn't have reached here