Update common-packer to latest master

The current version is out of date, and the latest changes are needed
for a successful build.

Change-Id: Id92fbe47bcac81bd3751decf0abc1022c1bee9b7
Signed-off-by: Eric Ball <eball@linuxfoundation.org>

diff --git a/packer/common-packer b/packer/common-packer
index 837c821..57648e1 160000 (submodule)
--- a/packer/common-packer
+++ b/packer/common-packer
@@ -1 +1 @@
-Subproject commit 837c821df6fa77bd81a73ecbee94bdd8e24b3172
+Subproject commit 57648e1600c3c2457900ad4872f26d8f5cd679c7