Use ignorabletest for devicemapper tests.

Bug: 260692911
Test: atest libdm_rust.test
Change-Id: I847f7afd29739850dde5d1ae6f346d11277155af
diff --git a/libs/devicemapper/Android.bp b/libs/devicemapper/Android.bp
index 9fa010c..b7cdedc 100644
--- a/libs/devicemapper/Android.bp
+++ b/libs/devicemapper/Android.bp
@@ -31,7 +31,10 @@
 
 rust_test {
     name: "libdm_rust.test",
-    defaults: ["libdm_rust.defaults"],
+    defaults: [
+        "libdm_rust.defaults",
+        "ignorabletest.defaults",
+    ],
     test_suites: ["general-tests"],
     rustlibs: [
         "librustutils",