arc: Add missing keys to support signing ARC images.

This adds missing networkstack keys required for sign scripts.
Keys are generated by:
   ./create_new_android_keys.sh ${VBOOT_REFERENCE}/tests/devkeys/android
   git checkout media.pk8 media.x509.pem platform.pk8 \
                platform.x509.pem releasekey.pk8 releasekey.x509.pem \
                shared.pk8 shared.x509.pem

BUG=b:170344735
TEST=build hatch based board with this feature on
BRANCH=none

Change-Id: I80376b8b07cc111d3ef51cf8a7bbc8dcfe8cfcc8
Signed-off-by: Yury Khmel <khmel@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2803655
Reviewed-by: Victor Hsieh <victorhsieh@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/tests/devkeys/android/networkstack.pk8 b/tests/devkeys/android/networkstack.pk8
new file mode 100644
index 0000000..890d9d3
--- /dev/null
+++ b/tests/devkeys/android/networkstack.pk8
Binary files differ
diff --git a/tests/devkeys/android/networkstack.x509.pem b/tests/devkeys/android/networkstack.x509.pem
new file mode 100644
index 0000000..042c4e3
--- /dev/null
+++ b/tests/devkeys/android/networkstack.x509.pem
@@ -0,0 +1,23 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----