[BiometricsV2] Refactor model code to kotlin

Bug: 286196884
Test: atest FingerprintEnrollmentActivityTest CredentialModelTest
      EnrollmentRequestTest FingerprintEnrollIntroViewModelTest
      FingerprintEnrollmentViewModelTest
Test: atest biometrics-enrollment-test
Change-Id: I2bdae4d2dd052d3664a790cd982edf51fcebec09
diff --git a/tests/unit/Android.bp b/tests/unit/Android.bp
index 8e81218..8dfb52e 100644
--- a/tests/unit/Android.bp
+++ b/tests/unit/Android.bp
@@ -41,7 +41,10 @@
     },
 
     // Include all test java files.
-    srcs: ["src/**/*.java"],
+    srcs: [
+        "src/**/*.java",
+        "src/**/*.kt",
+    ],
 
     platform_apis: true,
     test_suites: ["device-tests"],