Setup tests for libtrusty-rs

Test logic is based on the tests in the original tipc-test C binary,
but adapted to use the Rust unit test infrastructure to make running
tests easier.

Test: Ran the tests
Bug: 226659377
Change-Id: I998013b2f8b304299acb09d58beb49330747802a
diff --git a/trusty/libtrusty-rs/Android.bp b/trusty/libtrusty-rs/Android.bp
index 0c6349a..47c64b7 100644
--- a/trusty/libtrusty-rs/Android.bp
+++ b/trusty/libtrusty-rs/Android.bp
@@ -26,3 +26,12 @@
         "libnix",
     ],
 }
+
+rust_test {
+    name: "libtrusty-rs-tests",
+    crate_name: "trusty_test",
+    srcs: ["tests/test.rs"],
+    rustlibs: [
+        "libtrusty-rs",
+    ]
+}