Add libmemoffset to com.android.virt apex

This is a new dependency in newer crosvm.

Bug: 174797066
Test: m
Change-Id: I03032d4d80d2e89e5766dd0d5feca1577c3231a9
diff --git a/Android.bp b/Android.bp
index 37f0f91..efa8362 100644
--- a/Android.bp
+++ b/Android.bp
@@ -13,6 +13,10 @@
         "--cfg maybe_uninit",
         "--cfg tuple_ty",
     ],
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.virt",
+    ],
 }
 
 rust_defaults {