Prune TfliteGeneratedNnapiTest out of general-tests.

These tests define test_suite as 'general-tests' only but not used in
Test Mapping Suite. Hence, we plan to prune them to reduce size/build
time of general-tests.zip. They are listed as below:
 - TfliteGeneratedNnapiTest

Bug: 139893779

Test: m general-tests
      atest TfliteGeneratedNnapiTest
Change-Id: Iabb394179a0757de78ef8f6307d318b6725cd401
diff --git a/tensorflow/lite/testing/nnapi_tflite_zip_tests/Android.bp b/tensorflow/lite/testing/nnapi_tflite_zip_tests/Android.bp
index 9af542c..798bdc6 100644
--- a/tensorflow/lite/testing/nnapi_tflite_zip_tests/Android.bp
+++ b/tensorflow/lite/testing/nnapi_tflite_zip_tests/Android.bp
@@ -35,8 +35,5 @@
     shared_libs: [
         "liblog",
     ],
-    test_suites: [
-        "general-tests",
-    ],
 }