xtensa: Enable seccomp architecture tracking

To enable seccomp constant action bitmaps, we need to have a static
mapping to the audit architecture and system call table size. Add these
for xtensa.
Signed-off-by: NYiFei Zhu <yifeifz2@illinois.edu>
Signed-off-by: NKees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/79669648ba167d668ea6ffb4884250abcd5ed254.1605101222.git.yifeifz2@illinois.edu

arch/xtensa/include/asm/Kbuild

@@ -7,5 +7,4 @@ generic-y += mcs_spinlock.h
 generic-y += param.h
 generic-y += qrwlock.h
 generic-y += qspinlock.h
-generic-y += seccomp.h
 generic-y += user.h

arch/xtensa/include/asm/seccomp.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ASM_SECCOMP_H
+#define _ASM_SECCOMP_H
+
+#include <asm-generic/seccomp.h>
+
+#define SECCOMP_ARCH_NATIVE		AUDIT_ARCH_XTENSA
+#define SECCOMP_ARCH_NATIVE_NR		NR_syscalls
+#define SECCOMP_ARCH_NATIVE_NAME	"xtensa"
+
+#endif /* _ASM_SECCOMP_H */