x86/head64: Remove duplicate include

Remove duplicate header include.
Signed-off-by: Wang Qing <wangqing@vivo.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/1604893542-20961-1-git-send-email-wangqing@vivo.com

arch/x86/kernel/head64.c

@@ -37,7 +37,6 @@
 #include <asm/kasan.h>
 #include <asm/fixmap.h>
 #include <asm/realmode.h>
-#include <asm/desc.h>
 #include <asm/extable.h>
 #include <asm/trapnr.h>
 #include <asm/sev-es.h>