hqd: virtual display code clean up

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

Change-Id: Ibd7685791de6baa1bbf12ffe343443fcd7725269
diff --git a/Android.mk b/Android.mk
index 3fd19c1..772b66e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,4 +1,4 @@
-display-hals := libgralloc libgenlock libcopybit liblight libvirtual
+display-hals := libgralloc libgenlock libcopybit liblight
 display-hals += libhwcomposer liboverlay libqdutils libexternal libqservice
 display-hals += libmemtrack
 ifeq ($(call is-vendor-board-platform,QCOM),true)