display: Add QC Display utils

* Rename qcomui directory to qdutils
* Avoid inclusion of qcom_ui header
* Add class to get MDP version
* Add namespace for qdutils to prevent collison

Change-Id: I9a3f440e6b0fea1cfcc478ddca90af5df3bbb897
diff --git a/libhwcomposer/hwc.cpp b/libhwcomposer/hwc.cpp
index afd2aa9..a5e31ef 100644
--- a/libhwcomposer/hwc.cpp
+++ b/libhwcomposer/hwc.cpp
@@ -94,7 +94,7 @@
         for (size_t i=0; i<list->numHwLayers; i++) {
             if (list->hwLayers[i].flags & HWC_SKIP_LAYER) {
                 continue;
-            } else if (list->hwLayers[i].compositionType == HWC_USE_OVERLAY) {
+            } else if (list->hwLayers[i].compositionType == HWC_OVERLAY) {
                 drawLayerUsingOverlay(ctx, &(list->hwLayers[i]));
             }
         }