libfdt: Move the SBOM authors section

I was mistaken, and another maintainer pointed out the author-of-this-file
metadata needs to be in a different place. Apologies for the churn.

Signed-off-by: Richard Hughes <richard@hughsie.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/libfdt/sbom.cdx.json b/libfdt/sbom.cdx.json
index 303cf54..4d023e5 100644
--- a/libfdt/sbom.cdx.json
+++ b/libfdt/sbom.cdx.json
@@ -2,6 +2,13 @@
   "bomFormat": "CycloneDX",
   "specVersion": "1.6",
   "version": 1,
+  "metadata": {
+    "authors": [
+      {
+        "name": "@VCS_SBOM_AUTHORS@"
+      }
+    ]
+  },
   "components": [
     {
       "type": "library",
@@ -10,11 +17,6 @@
       "name": "libfdt",
       "version": "@VCS_VERSION@",
       "description": "Utility library for reading and manipulating the FDT binary format",
-      "authors": [
-        {
-          "name": "@VCS_SBOM_AUTHORS@"
-        }
-      ],
       "supplier": {
         "name": "libfdt developers"
       },