display: Add setSecondaryDisplayStatus API

- Clients(SecureUI/WFD FW) will use this API to set status of the
  Secondary display
- Status can be offline/pause/resume
- Secondary display will be hdmi/wfd, HWC will free up pipes for
  these displays

Change-Id: I25d5e070b60c38daeb102349bed14bb6de0a5684
diff --git a/libqservice/IQService.h b/libqservice/IQService.h
index 3be20f1..87d51fc 100644
--- a/libqservice/IQService.h
+++ b/libqservice/IQService.h
@@ -49,8 +49,8 @@
         GET_DISPLAY_ATTRIBUTES,  // Get display attributes
         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
+        SET_SECONDARY_DISPLAY_STATUS,  // Sets secondary display status
+        UNUSED_SLOT,             // XXX: Unsed - New one can go here
         SET_VIEW_FRAME,          // Set view frame of display
         DYNAMIC_DEBUG,           // Enable more logging on the fly
         SET_IDLE_TIMEOUT,        // Set idle timeout for GPU fallback