[SYCL] supprt Flash Attention for fp32/fp16/Q4/Q5/Q8 (#20190)

* support flash-attention for fp32/fp16/Q4/Q5/Q8

* rm warining

* update for JIT

ggml/src/ggml-sycl/fattn.hpp

@@ -0,0 +1,22 @@
+//
+// MIT license
+// Copyright (C) 2025 Intel Corporation
+// SPDX-License-Identifier: MIT
+//
+
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+
+#ifndef GGML_SYCL_FATTN_HPP
+#define GGML_SYCL_FATTN_HPP
+
+#include "common.hpp"
+
+void ggml_sycl_flash_attn_ext(ggml_backend_sycl_context & ctx, ggml_tensor * dst);
+
+bool ggml_sycl_flash_attn_ext_supported(int device, const ggml_tensor * dst);
+
+#endif // GGML_SYCL_FATTN_HPP