Adding microdroid-vendor security patch information in microdroid vbmeta

Bug: 285855436
Test: atest MicrodroidTests#bootsWithVendorPartition

Change-Id: If43dc6ec0a01182b8fb9323d549f3cabd0d942b6
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 4e735e6..98af769 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -392,6 +392,16 @@
             partitions: ["microdroid_vendor"],
         },
     },
+    // TODO(b/312809093): Remove hard-coded property after figuring out the
+    // long-term solution for microdroid vendor partition SPL. The hard-coded
+    // value is the minimum value of SPL that microdroid vendor partition will
+    // have. It's for passing the check 'IsStandaloneImageRollback'.
+    avb_properties: [
+        {
+            key: "com.android.build.microdroid-vendor.security_patch",
+            value: "2023-12-05",
+        },
+    ],
 }
 
 prebuilt_etc {