bundle_firmware: Add force-fastboot-full-cap under gbb_flag_properties

BUG=chrome-os-partner:40196
BRANCH=None
TEST=Added gbb-flag-force-fastboot-full-cap to smaug
fmap.dts. Verified flag is set on image created by emerge-smaug
chromeos-bootimage.

Change-Id: Ib5694c435a84d561a79758697a7f7066162e6d49
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://chromium-review.googlesource.com/271610
Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>

host/lib/bundle_firmware.py

diff --git a/host/lib/bundle_firmware.py b/host/lib/bundle_firmware.py
index 5ab7a5e..bf17a16 100644
--- a/host/lib/bundle_firmware.py
+++ b/host/lib/bundle_firmware.py
@@ -70,6 +70,7 @@
   'disable-ec-software-sync': 0x00000200,
   'default-dev-boot-legacy': 0x00000400,
   'disable-pd-software-sync': 0x00000800,
+  'force-dev-boot-fastboot-full-cap': 0x00002000,
 }
 
 # Maps board name to Exynos product number