EFS: Add key generator for EC EFS

This patch adds a script which generates a key pair for signing
& verifying EC-RW copies.

BUG=b:66956286
BRANCH=none
TEST=Verify the script generates indented key pair

Change-Id: Ia5aff7130587d4f1e18bcdfa514a953caa0cf183
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/731824
Reviewed-by: C Shapiro <shapiroc@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>

scripts/keygeneration/accessory/create_new_ec_efs_key.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Copyright 2017 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Load common constants and functions.
+. "$(dirname "$0")/common_leverage_hammer.sh"
+
+main() {
+  set -e
+
+  leverage_hammer_to_create_key "ec_efs" "$@"
+}
+
+main "$@"