Rename bert_nlclassifier/ directory to just bert/

This makes it less likely to run into limits on file name length, and the `nlclassifier` is already contained in the parent directory of the full path (`@tensorflow_lite_support/java/src/native/task/text/nlclassifier/bert`).

PiperOrigin-RevId: 370409425

Author: tensorflower-gardener

tensorflow_lite_support/java/src/java/org/tensorflow/lite/task/text/nlclassifier/BUILD

@@ -59,7 +59,7 @@ android_library_with_tflite(
     ],
     javacopts = JAVACOPTS,
     tflite_exports = [
-        "//tensorflow_lite_support/java/src/native/task/text/nlclassifier/bert_nlclassifier:bert_nl_classifier_native",
+        "//tensorflow_lite_support/java/src/native/task/text/nlclassifier/bert:bert_nl_classifier_native",
     ],
     deps = [
         "//tensorflow_lite_support/java:tensorflowlite_support_java",

tensorflow_lite_support/java/src/native/task/text/BUILD

@@ -16,7 +16,7 @@ jni_binary_with_tflite(
     name = "libtask_text_jni.so",
     srcs = [
         "//tensorflow_lite_support/java/src/native/task/text/nlclassifier:nl_classifier_jni.cc",
-        "//tensorflow_lite_support/java/src/native/task/text/nlclassifier/bert_nlclassifier:bert_nl_classifier_jni.cc",
+        "//tensorflow_lite_support/java/src/native/task/text/nlclassifier/bert:bert_nl_classifier_jni.cc",
         "//tensorflow_lite_support/java/src/native/task/text/qa:bert_question_answerer_jni.cc",
     ],
     linkscript = "//tensorflow_lite_support/java:default_version_script.lds",