LE: Add is_connected() function (1/3)

Change-Id: I1b94ab0c8b0ff2e1026a4f5bbe95dca25be3d104
diff --git a/include/hardware/bluetooth.h b/include/hardware/bluetooth.h
index 19c3410..c3256ba 100644
--- a/include/hardware/bluetooth.h
+++ b/include/hardware/bluetooth.h
@@ -465,6 +465,13 @@
     /** Cancel Bond */
     int (*cancel_bond)(const bt_bdaddr_t *bd_addr);
 
+    /**
+     * Get the connection status for a given remote device.
+     * return value of 0 means the device is not connected,
+     * non-zero return status indicates an active connection.
+     */
+    int (*get_connection_state)(const bt_bdaddr_t *bd_addr);
+
     /** BT Legacy PinKey Reply */
     /** If accept==FALSE, then pin_len and pin_code shall be 0x0 */
     int (*pin_reply)(const bt_bdaddr_t *bd_addr, uint8_t accept,