vpd: Add another undocumented key to check_rw_vpd

Adding battery_cto_disabled (eve).

BUG=chromium:752017
TEST=manual
BRANCH=none

Change-Id: Ieca191f92303fb0a786ce788790fc36a1d0535bc
Reviewed-on: https://chromium-review.googlesource.com/895486
Commit-Ready: Thiemo Nagel <tnagel@chromium.org>
Tested-by: Thiemo Nagel <tnagel@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
diff --git a/util/check_rw_vpd b/util/check_rw_vpd
index 5c3ebf7..4d51e30 100644
--- a/util/check_rw_vpd
+++ b/util/check_rw_vpd
@@ -35,6 +35,8 @@
 #   "factory.device_data.smt_complete"="True"
 #   "MTM"="20425"
 #   "UUID"="325A2d25C48811E3ADFAF8A963268EC7"
+# eve:
+#   "battery_cto_disabled"="1"
 # gnawty:
 #   "ec_status"="False"
 # guado:
@@ -62,6 +64,7 @@
 # Undocumented but well-known RW_VPD keys. Keeping those for the time being.
 UNDOCUMENTED_VPD_KEYS="
   asset_tag
+  battery_cto_disabled
   BIOS
   BTMac
   BT_MAC