Add outbuf fields for HWC 1.2 virtual displays

Also rename HWC_DISPLAY_RESOLUTION_* to HWC_DISPLAY_WIDTH and
HWC_DISPLAY_HEIGHT for consistency.

Change-Id: Iabe6db0816f6f6eaaac24c3c9ae554177bcabf1d
diff --git a/include/hardware/hwcomposer_defs.h b/include/hardware/hwcomposer_defs.h
index 60cf827..ef8fcf1 100644
--- a/include/hardware/hwcomposer_defs.h
+++ b/include/hardware/hwcomposer_defs.h
@@ -162,8 +162,8 @@
     HWC_DISPLAY_VSYNC_PERIOD                = 1,
 
     /* The number of pixels in the horizontal and vertical directions. */
-    HWC_DISPLAY_RESOLUTION_X                = 2,
-    HWC_DISPLAY_RESOLUTION_Y                = 3,
+    HWC_DISPLAY_WIDTH                       = 2,
+    HWC_DISPLAY_HEIGHT                      = 3,
 
     /* The number of pixels per thousand inches of this configuration.
      *