ui: Restore DisplayIdentification_test

Id74a2c646558d61bb1a8ae80b038f7108e54e636 accidentally dropped it.

Bug: None
Test: atest DisplayIdentification_test
Change-Id: Id075b4dfa178e49e2c5ea349099ca4eac0108da8

Author: Dominik Laskowski

libs/ui/tests/Android.bp

@@ -53,6 +53,17 @@ cc_test {
     ],
 }
 
+cc_test {
+    name: "DisplayIdentification_test",
+    shared_libs: ["libui"],
+    static_libs: ["libgmock"],
+    srcs: ["DisplayIdentification_test.cpp"],
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+}
+
 cc_test {
     name: "FlattenableHelpers_test",
     shared_libs: ["libui"],