Rename AnnouncementObserver to AnnouncementListener.

I feel this wording match java naming more closely.

Bug: 68045105
Test: VTS
Change-Id: If30fa9b356b6b45fe8853bc5194c7098d0fb2aa5
diff --git a/broadcastradio/2.0/default/BroadcastRadio.cpp b/broadcastradio/2.0/default/BroadcastRadio.cpp
index d16aaff..aa5afad 100644
--- a/broadcastradio/2.0/default/BroadcastRadio.cpp
+++ b/broadcastradio/2.0/default/BroadcastRadio.cpp
@@ -141,9 +141,9 @@
     return {};
 }
 
-Return<void> BroadcastRadio::registerAnnouncementObserver(
-    const hidl_vec<AnnouncementType>& enabled, const sp<IAnnouncementObserver>& /* cb */,
-    registerAnnouncementObserver_cb _hidl_cb) {
+Return<void> BroadcastRadio::registerAnnouncementListener(
+    const hidl_vec<AnnouncementType>& enabled, const sp<IAnnouncementListener>& /* listener */,
+    registerAnnouncementListener_cb _hidl_cb) {
     ALOGV("%s(%s)", __func__, toString(enabled).c_str());
 
     _hidl_cb(Result::NOT_SUPPORTED, nullptr);
diff --git a/broadcastradio/2.0/default/BroadcastRadio.h b/broadcastradio/2.0/default/BroadcastRadio.h
index 7904946..8c14d9e 100644
--- a/broadcastradio/2.0/default/BroadcastRadio.h
+++ b/broadcastradio/2.0/default/BroadcastRadio.h
@@ -36,9 +36,9 @@
     Return<void> getDabRegionConfig(getDabRegionConfig_cb _hidl_cb);
     Return<void> openSession(const sp<ITunerCallback>& callback, openSession_cb _hidl_cb) override;
     Return<void> getImage(uint32_t id, getImage_cb _hidl_cb);
-    Return<void> registerAnnouncementObserver(const hidl_vec<AnnouncementType>& enabled,
-                                              const sp<IAnnouncementObserver>& cb,
-                                              registerAnnouncementObserver_cb _hidl_cb);
+    Return<void> registerAnnouncementListener(const hidl_vec<AnnouncementType>& enabled,
+                                              const sp<IAnnouncementListener>& listener,
+                                              registerAnnouncementListener_cb _hidl_cb);
 
     std::reference_wrapper<const VirtualRadio> mVirtualRadio;
     Properties mProperties;