Display and wfd synchronization during teardown

* Provide a binder interface call for wfd module
to inform display about the start/stop/pause/resume
of wfd session.

* This is needed for wfd-hdmi synchronization in
case of v4l2 wfd solution. If hdmi is plugged
in during v4l2 wfd session, display-hal waits in
uevent thread for wfd teardown notification from
wfd module, before going ahead with configuring
external display.

* For VDS WFD solution, display-hal waits in uevent
thread for wfd-teardown to be signalled from
the composition thread.

Change-Id: I9514cb5bc7ff81de0b5dd4cdf66d8286a64ba094
diff --git a/libqservice/IQService.h b/libqservice/IQService.h
index 6c1bba6..02f7341 100644
--- a/libqservice/IQService.h
+++ b/libqservice/IQService.h
@@ -50,6 +50,7 @@
         SET_HSIC_DATA,           // Set HSIC on dspp
         GET_DISPLAY_VISIBLE_REGION,  // Get the visibleRegion for dpy
         PAUSE_WFD,               // Pause/Resume WFD
+        SET_WFD_STATUS,          // Set if wfd connection is on/off
         COMMAND_LIST_END = 400,
     };