sync: normalize more of Linux UAPI headers

Normalize UAPI headers that had single underscore between UAPI and LINUX.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

include/uapi/linux/if_link.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _UAPI_LINUX_IF_LINK_H
-#define _UAPI_LINUX_IF_LINK_H
+#ifndef _LINUX_IF_LINK_H
+#define _LINUX_IF_LINK_H
 
 #include <linux/types.h>
 #include <linux/netlink.h>
@@ -1977,4 +1977,4 @@ enum {
 
 #define IFLA_DSA_MAX	(__IFLA_DSA_MAX - 1)
 
-#endif /* _UAPI_LINUX_IF_LINK_H */
+#endif /* _LINUX_IF_LINK_H */