[dice] Move open-dice Rust wrapper libraries to virt

Since these wrapper libraries are only used in virt projects.

The tests are added to busytown config at cl/573729094.

Test: atest MicrodroidHostTests
Change-Id: I2479086c5ee5f1c7ce8884d32cf18f6f4cf07172
diff --git a/TEST_MAPPING b/TEST_MAPPING
index f1bfe09..1410534 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -84,6 +84,9 @@
       "path": "packages/modules/Virtualization/libs/devicemapper"
     },
     {
+      "path": "packages/modules/Virtualization/libs/dice"
+    },
+    {
       "path": "packages/modules/Virtualization/libs/libfdt"
     },
     {