Define emergency alert system in bcradio HAL

Bug: 361348719
Flag: EXEMPT HAL interface change
Test: atest VtsHalBroadcastradioAidlTargetTest
Change-Id: Iaffe7f34dd4d48dc15d339b7c7321952bab1f1db
diff --git a/broadcastradio/aidl/Android.bp b/broadcastradio/aidl/Android.bp
index 82ee949..081bae3 100644
--- a/broadcastradio/aidl/Android.bp
+++ b/broadcastradio/aidl/Android.bp
@@ -51,12 +51,12 @@
         },
 
     ],
-    frozen: true,
+    frozen: false,
 
 }
 
 // Note: This should always be one version ahead of the last frozen version
-latest_android_hardware_broadcastradio = "android.hardware.broadcastradio-V2"
+latest_android_hardware_broadcastradio = "android.hardware.broadcastradio-V3"
 
 cc_defaults {
     name: "latest_android_hardware_broadcastradio_ndk_static",