display: Reconcile display HALs

Make the display HALs compile with/without the Qualcomm BSP
specific features so they can work with pure AOSP.
Change-Id: I1ad7282c4fe1fe7e3309afb530a07735f165ffbe
diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index e764c69..8ce9f0d 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -24,6 +24,11 @@
 #include "hwc_copybit.h"
 #include "comptype.h"
 
+//XXX: Remove HWC_BLIT
+#ifndef QCOM_BSP
+#define HWC_BLIT 4
+#endif
+
 namespace qhwc {
 
 struct range {