Add AllocationCreateStrided to support lib CPU driver

 - Able to create Allocations with arbitrary alignment requirement,
   making Incremental Intrinsic Support able to run with different
   native GPU RS runtime.
 - Make compat mode CPU driver using an additional rs_compat.spec.
 - Add a compat mode only USAGE_INCREMENTAL_SUPPORT.
 - Add AllocationCreateStrided() to take an Alignment requirement (power
   of 2). Only enbled when detect USAGE_INCREMENTAL_SUPPORT.

Change-Id: I66f913c3a2474f93af5a244c0c84460a7a395e71
diff --git a/rsDriverLoader.cpp b/rsDriverLoader.cpp
index 7b728b6..125a6df 100644
--- a/rsDriverLoader.cpp
+++ b/rsDriverLoader.cpp
@@ -109,6 +109,9 @@
     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);
+#ifdef RS_COMPATIBILITY_LIB
+    ret &= fn(RS_HAL_ALLOCATION_INIT_STRIDED, (void **)&rsc->mHal.funcs.allocation.initStrided);
+#endif
 
     ret &= fn(RS_HAL_SAMPLER_INIT, (void **)&rsc->mHal.funcs.sampler.init);
     ret &= fn(RS_HAL_SAMPLER_DESTROY, (void **)&rsc->mHal.funcs.sampler.destroy);