Remove apex_test_build_features

The testing-purpose APEX no longer exists.

Test: m
Change-Id: I2809a834d9f83176a27d7cf0ad45a0eed553cfc8
diff --git a/libs/binder/Android.bp b/libs/binder/Android.bp
index 2cd20b5..643a956 100644
--- a/libs/binder/Android.bp
+++ b/libs/binder/Android.bp
@@ -74,7 +74,6 @@
     apex_available: [
         "//apex_available:platform",
         // TODO(b/139016109) remove these three
-        "apex_test_build_features",
         "com.android.media.swcodec",
         "test_com.android.media.swcodec",
     ],