Cleanup includes in c10/core/CPUAllocator.cpp. (#19885)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19885
ghimport-source-id: 1f7d228ac8d1dd9aeb70446a6baf63f62f195663

Differential Revision: D15118516

Pulled By: ZolotukhinM

fbshipit-source-id: bdaf56d97db9e70cbd36ca03349f6eabfbac2668
diff --git a/c10/core/CPUAllocator.cpp b/c10/core/CPUAllocator.cpp
index e418cb8..7ce339d 100644
--- a/c10/core/CPUAllocator.cpp
+++ b/c10/core/CPUAllocator.cpp
@@ -1,5 +1,4 @@
 #include <c10/core/CPUAllocator.h>
-#include <c10/util/typeid.h>
 #include <c10/core/DeviceType.h>
 
 // TODO: rename flags to C10