Enable ubsan in inputflinger_tests

To ensure correctness, let's enable ubsan checker. Starting with just
our inputflinger tests first.

Bug: 251249010
Test: m inputflinger_tests && $ANDROID_HOST_OUT/nativetest64/inputflinger_tests/inputflinger_tests
Change-Id: Id340838fc87a5250ca131bd16023d8476cdec55d
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index af40fed..97138c7 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -86,6 +86,13 @@
             ],
         },
     },
+    sanitize: {
+        undefined: true,
+        all_undefined: true,
+        diag: {
+            undefined: true,
+        },
+    },
     static_libs: [
         "libc++fs",
         "libgmock",