util/scripts/cross-repo-cherrypick: Modify output format

As far as I know the Chromium OS team is the only user of this script,
so align its output with that of other tools used there:

- Replace "Original-Commit-Id" with "GitOrigin-RevId"
- Reuse Change-Id instead of moving it to the Original- prefix, which
  leads to the creation of a new Change ID.

Change-Id: I8c39c512901c83a64f00aa48a539e6621f827242
Signed-off-by: Patrick Georgi <patrick@coreboot.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60979
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
diff --git a/util/scripts/cross-repo-cherrypick b/util/scripts/cross-repo-cherrypick
index c640e33..7442b9b 100755
--- a/util/scripts/cross-repo-cherrypick
+++ b/util/scripts/cross-repo-cherrypick
@@ -50,19 +50,22 @@
 
 (printf "${MESSAGE_PREFIX}"; commit_message) | tac | awk '/^$/ {
 		if (end==0) {
-			print "Original-Commit-Id: '"${CID}"'\nSigned-off-by: '"${GUID}"'";
+			print "GitOrigin-RevId: '"${CID}"'\nSigned-off-by: '"${GUID}"'";
 			'"${SPLICE_CMD}"'
 		}
 		end=1
 	}; /^(BUG|BRANCH|TEST)=/ {
 		if (end==0) {
-			print "Original-Commit-Id: '"${CID}"'\nSigned-off-by: '"${GUID}"'";
+			print "GitOrigin-RevId: '"${CID}"'\nSigned-off-by: '"${GUID}"'";
 			print "";
 		}
 		end=1
 	}; /^Cq-Depend:/ {
 		print $0;
 		next
+	}; /^Change-Id:/ {
+		print $0;
+		next
 	}; {
 		if (end==0)
 			print "Original-" $0;