x86/platform/amd: Add standard header guards to <asm/amd/ibs.h>

Signed-off-by: Ingo Molnar <[e-mail]>
Acked-by: Borislav Petkov (AMD) <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Mario Limonciello <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/x86/include/asm/amd/ibs.h

···
 /* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_AMD_IBS_H
+#define _ASM_X86_AMD_IBS_H
+
 /*
  * From PPR Vol 1 for AMD Family 19h Model 01h B1
  * 55898 Rev 0.35 - Feb 5, 2021
···
 	};
 	u64		regs[MSR_AMD64_IBS_REG_COUNT_MAX];
 };
+
+#endif /* _ASM_X86_AMD_IBS_H */