Add API for AVRCP CT get_play_status_cmd

Bug: b/31684931
Change-Id: I5e47e3b1ab30f457ee2581d02a384ffb76454a21
(cherry picked from commit de0f636db2035deff127fdd5f62ed2043650b270)
diff --git a/include/hardware/bt_rc.h b/include/hardware/bt_rc.h
index a0f3bd6..71a8901 100644
--- a/include/hardware/bt_rc.h
+++ b/include/hardware/bt_rc.h
@@ -686,6 +686,9 @@
     bt_status_t (*play_item_cmd) (
         bt_bdaddr_t *bd_addr, uint8_t scope, uint8_t *uid, uint16_t uid_counter);
 
+    /** get the playback state */
+    bt_status_t (*get_playback_state_cmd) (bt_bdaddr_t *bd_addr);
+
     /** get the now playing list */
     bt_status_t (*get_now_playing_list_cmd) (bt_bdaddr_t *bd_addr, uint8_t start, uint8_t items);