x86/setup: Drop unneeded include <asm/dmi.h>

arch/x86/kernel/setup.c includes <asm/dmi.h> but it doesn't look
like it needs it, <linux/dmi.h> is sufficient.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Link: http://lkml.kernel.org/r/1366881845.4186.65.camel@chaos.site


Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>