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/libgralloc/gpu.cpp b/libgralloc/gpu.cpp
index 291f564..15d7329 100644
--- a/libgralloc/gpu.cpp
+++ b/libgralloc/gpu.cpp
@@ -47,7 +47,9 @@
     common.module  = const_cast<hw_module_t*>(&module->base.common);
     common.close   = gralloc_close;
     alloc          = gralloc_alloc;
+#ifdef QCOM_BSP
     allocSize      = gralloc_alloc_size;
+#endif
     free           = gralloc_free;
 
 }