[AST] Remove unnecessary include (NFC)

This was introduced in #115777, but isn't actually used.

Author: nikic

clang/include/clang/AST/Type.h

@@ -31,7 +31,6 @@
 #include "clang/Basic/PointerAuthOptions.h"
 #include "clang/Basic/SourceLocation.h"
 #include "clang/Basic/Specifiers.h"
-#include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/Visibility.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/APSInt.h"