Camera: use gralloc mapper for handle import

Bug: 37540361
Test: marlin, smoke test GCA
Change-Id: I9d58d9c6af20b37c016f036bce2dcf55817c59aa
diff --git a/camera/device/3.2/default/CameraDeviceSession.h b/camera/device/3.2/default/CameraDeviceSession.h
index 7682165..55edadb 100644
--- a/camera/device/3.2/default/CameraDeviceSession.h
+++ b/camera/device/3.2/default/CameraDeviceSession.h
@@ -128,7 +128,7 @@
     // Stream ID -> circulating buffers map
     std::map<int, CirculatingBuffers> mCirculatingBuffers;
 
-    static HandleImporter& sHandleImporter;
+    static HandleImporter sHandleImporter;
 
     bool mInitFail;