Add -pkvm_experimental to the microdroid_gki_android14-6.1 artifacts

Current name suggests that android14-6.1 GKI can be run as guest, which
is not true. Resolve this confusion by explicitly specifying
-pkvm_experimental to the name, which points out that this image was
built from the android14-6.1-pkvm_experimental branch.

Bug: 329383978
Test: AVF presubmit
Test: vm run-microdroid --gki android14-6.1-pkvm_experimental
Change-Id: I0b93e0aacb9dde58c9a3c696d5a073e1800ec325
diff --git a/microdroid/microdroid_gki-android14-6.1-pkvm_experimental.json b/microdroid/microdroid_gki-android14-6.1-pkvm_experimental.json
new file mode 100644
index 0000000..4e58573
--- /dev/null
+++ b/microdroid/microdroid_gki-android14-6.1-pkvm_experimental.json
@@ -0,0 +1,20 @@
+{
+  "kernel": "/apex/com.android.virt/etc/fs/microdroid_gki-android14-6.1-pkvm_experimental_kernel",
+  "disks": [
+    {
+      "partitions": [
+        {
+          "label": "vbmeta_a",
+          "path": "/apex/com.android.virt/etc/fs/microdroid_vbmeta.img"
+        },
+        {
+          "label": "super",
+          "path": "/apex/com.android.virt/etc/fs/microdroid_super.img"
+        }
+      ],
+      "writable": false
+    }
+  ],
+  "memory_mib": 256,
+  "platform_version": "~1.0"
+}