Notify drivers when user get a pointer to allocation

Requested by vendor for driver bring-up.

bug 20894664

Change-Id: I7a1540236e557ef42ffde1c832b5d5ef36b91c96
diff --git a/rsDriverLoader.cpp b/rsDriverLoader.cpp
index 2bc53b6..5bfb8e5 100644
--- a/rsDriverLoader.cpp
+++ b/rsDriverLoader.cpp
@@ -108,6 +108,7 @@
     ret &= fn(RS_HAL_ALLOCATION_GENERATE_MIPMAPS, (void **)&rsc->mHal.funcs.allocation.generateMipmaps);
     ret &= fn(RS_HAL_ALLOCATION_UPDATE_CACHED_OBJECT, (void **)&rsc->mHal.funcs.allocation.updateCachedObject);
     ret &= fn(RS_HAL_ALLOCATION_ADAPTER_OFFSET, (void **)&rsc->mHal.funcs.allocation.adapterOffset);
+    ret &= fn(RS_HAL_ALLOCATION_GET_POINTER, (void **)&rsc->mHal.funcs.allocation.getPointer);
 
     ret &= fn(RS_HAL_SAMPLER_INIT, (void **)&rsc->mHal.funcs.sampler.init);
     ret &= fn(RS_HAL_SAMPLER_DESTROY, (void **)&rsc->mHal.funcs.sampler.destroy);