Detect duplicates in sdkRegistry

Bug: 195754365
Test: m nothing
Change-Id: I67c5022b7cc61891fd6b90365f8271d97d7bcd98
diff --git a/android/Android.bp b/android/Android.bp
index f3a3850..6450a06 100644
--- a/android/Android.bp
+++ b/android/Android.bp
@@ -110,6 +110,7 @@
         "paths_test.go",
         "prebuilt_test.go",
         "rule_builder_test.go",
+        "sdk_test.go",
         "singleton_module_test.go",
         "soong_config_modules_test.go",
         "util_test.go",