rename heap_mask -> heap_id_mask

The Ion API is changing yet again. heap_mask has been renamed in Ion to
heap_id_mask. Rename ours.

Change-Id: I70154b7166ce66b27ae37e31345f32480d2b9b2d
diff --git a/libgralloc/ionalloc.cpp b/libgralloc/ionalloc.cpp
index e6d34f8..2097320 100644
--- a/libgralloc/ionalloc.cpp
+++ b/libgralloc/ionalloc.cpp
@@ -73,11 +73,7 @@
 
     ionAllocData.len = data.size;
     ionAllocData.align = data.align;
-#ifdef QCOM_BSP
-    ionAllocData.heap_mask = data.flags & ~ION_SECURE;
-#else
     ionAllocData.heap_id_mask = data.flags & ~ION_SECURE;
-#endif
     ionAllocData.flags = data.uncached ? 0 : ION_FLAG_CACHED;
     // ToDo: replace usage of alloc data structure with
     //  ionallocdata structure.