Enabled en_IN for Assistant

Bug: b/139671272
Change-Id: I9044de4ba7d75788b10deb4c005a35c964f8f417
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761236Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Umesh Patil <upatil@google.com>
Cr-Commit-Position: refs/heads/master@{#688270}

chrome/browser/chromeos/assistant/assistant_util.cc

@@ -63,6 +63,7 @@ ash::mojom::AssistantAllowedState IsAssistantAllowedForProfile(
                                          ULOC_US,
                                          "da",
                                          "en_AU",
+                                         "en_IN",
                                          "en_NZ",
                                          "es_ES",
                                          "es_MX",