[PATCH] perf/x86/intel: Fix warnings in intel_ds.h

[huzhi001]

The following checkpatch warnings are removed:
WARNING: Missing or malformed SPDX-License-Identifier tag in line 1

Signed-off-by: ZhiHu <huzhi001@xxxxxxxxxx>
---
 arch/x86/include/asm/intel_ds.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/intel_ds.h 
b/arch/x86/include/asm/intel_ds.h
index 2f9eeb5c3069..6bc6621f6d9f 100644
--- a/arch/x86/include/asm/intel_ds.h
+++ b/arch/x86/include/asm/intel_ds.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_INTEL_DS_H
 #define _ASM_INTEL_DS_H