[clang][SYCL] Add a missing include to make the header standalone

Author: gribozavr

clang/include/clang/AST/SYCLKernelInfo.h

@@ -13,6 +13,7 @@
 #ifndef LLVM_CLANG_AST_SYCLKERNELINFO_H
 #define LLVM_CLANG_AST_SYCLKERNELINFO_H
 
+#include "clang/AST/CanonicalType.h"
 #include "clang/AST/Decl.h"
 #include "clang/AST/Type.h"