FPGA: Replace CL/sycl.hpp with sycl/sycl.hpp for fpga_compile (#2395)

Replace CL/sycl.hpp with sycl/sycl.hpp for fpga_compile because it is deprecated

Author: intel-jisheng1

DirectProgramming/C++SYCL_FPGA/Tutorials/GettingStarted/fpga_compile/part3_dpcpp_lambda_usm/src/vector_add.cpp

@@ -2,7 +2,7 @@
 #include <vector>
 
 // oneAPI headers
-#include <CL/sycl.hpp>
+#include <sycl/sycl.hpp>
 #include <sycl/ext/intel/fpga_extensions.hpp>
 
 using namespace sycl;
@@ -96,4 +96,4 @@ int main() {
     std::terminate();
   }
   return passed ? EXIT_SUCCESS : EXIT_FAILURE;
-}
+}