Microdroid: Add support for android15-6.6 GKI as guest kernel

Bug: 325991735
Test: build & install virt APEX with android15-6.6 GKI
Test: AVF presubmit tests
Change-Id: I16b5b4e0927cbddd000d17724319bcecd5ab6640
diff --git a/microdroid/microdroid_gki-android15-6.6.json b/microdroid/microdroid_gki-android15-6.6.json
new file mode 100644
index 0000000..f7f6d47
--- /dev/null
+++ b/microdroid/microdroid_gki-android15-6.6.json
@@ -0,0 +1,20 @@
+{
+  "kernel": "/apex/com.android.virt/etc/fs/microdroid_gki-android15-6.6_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"
+}