SYCL backend updates for latest oneAPI release/2025.0.5 (#1815)

* Fixes for oneAPI-2025

* Neat fix for oneAPI 2025

* style changes

Author: uumesh

backends/sycl/ceed-sycl-common.sycl.cpp

@@ -8,6 +8,7 @@
 
 #include "ceed-sycl-common.hpp"
 
+#include <sstream>
 #include <string>
 #include <sycl/sycl.hpp>
 

backends/sycl/online_compiler.hpp

@@ -63,7 +63,7 @@ class device_arch {
 class online_compile_error : public sycl::exception {
  public:
   online_compile_error() = default;
-  online_compile_error(const std::string &Msg) : sycl::exception(Msg) {}
+  online_compile_error(const std::string &Msg) : sycl::exception(make_error_code(errc::invalid), Msg) {}
 };
 
 /// Designates a source language for the online compiler.