Remove uneeded drf_reverse overwrite

* `drf_reverse()` was introduced here 1a75b1836e
* There is a comment about monkey patching. I can't find the monkey patch it is referencing.
* AWX `drf_reverse()` is a copy paste of this https://github.com/encode/django-rest-framework/blob/master/rest_framework/reverse.py#L32
  * The only difference is DRF's version calls `preserve_builtin_query_params()`
    * `preserve_builtin_query_params()` only does something if `api_settings.URL_FORMAT_OVERRIDE` is defined.
      * We don't use `REST_FRAMEWORK.URL_FORMAT_OVERRIDE`

awx/main/tests/functional/api/test_auth.py

@@ -6,7 +6,7 @@ from django.test import Client
 from rest_framework.test import APIRequestFactory
 
 from awx.api.generics import LoggedLoginView
-from awx.api.versioning import drf_reverse
+from rest_framework.reverse import reverse as drf_reverse
 
 
 @pytest.mark.django_db

awx/main/tests/functional/api/test_oauth.py

@@ -8,8 +8,10 @@ from django.db import connection
 from django.test.utils import override_settings
 from django.utils.encoding import smart_str, smart_bytes
 
+from rest_framework.reverse import reverse as drf_reverse
+
 from awx.main.utils.encryption import decrypt_value, get_encryption_key
-from awx.api.versioning import reverse, drf_reverse
+from awx.api.versioning import reverse
 from awx.main.models.oauth import OAuth2Application as Application, OAuth2AccessToken as AccessToken
 from awx.main.tests.functional import immediate_on_commit
 from awx.sso.models import UserEnterpriseAuth