hqd: virtual display code clean up

Remove V4L2 based virtual display functions as it is
no longer used.

Change-Id: Ibd7685791de6baa1bbf12ffe343443fcd7725269
diff --git a/libhwcomposer/hwc_qclient.cpp b/libhwcomposer/hwc_qclient.cpp
index efe6e16..d09411f 100644
--- a/libhwcomposer/hwc_qclient.cpp
+++ b/libhwcomposer/hwc_qclient.cpp
@@ -233,7 +233,7 @@
             if (debug_type != IQService::DEBUG_ALL)
                 break;
         case IQService::DEBUG_VD:
-            HWCVirtualBase::dynamicDebug(enable);
+            HWCVirtualVDS::dynamicDebug(enable);
             if (debug_type != IQService::DEBUG_ALL)
                 break;
     }