Added new owner to broadcast AIDL HAL

Bug: 170336130
Test: m -j
Change-Id: I63d6c0f1a32b7f75a17b0c1a4e1d9b47bdc9a17f
diff --git a/broadcastradio/aidl/OWNERS b/broadcastradio/aidl/OWNERS
new file mode 100644
index 0000000..302fdd7
--- /dev/null
+++ b/broadcastradio/aidl/OWNERS
@@ -0,0 +1,4 @@
+xuweilin@google.com
+oscarazu@google.com
+ericjeong@google.com
+keunyoung@google.com