Fix build break for size_t vs. uint32_t difference.

Change-Id: I11b9592214c4fa57ef62f42fd086a5a3df33abbf
diff --git a/cpu_ref/rsCpuIntrinsic.h b/cpu_ref/rsCpuIntrinsic.h
index 85e2ddc..bf6a8ac 100644
--- a/cpu_ref/rsCpuIntrinsic.h
+++ b/cpu_ref/rsCpuIntrinsic.h
@@ -39,7 +39,7 @@
 
     virtual void invokeForEachMulti(uint32_t slot,
                        const Allocation ** ain,
-                       size_t inLen,
+                       uint32_t inLen,
                        Allocation * aout,
                        const void * usr,
                        uint32_t usrLen,