x86, realmode: fixes compilation issue in tboot.c

Fixed include path of wakeup.h in tboot.c.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-23-git-send-email-jarkko.sakkinen@intel.com


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>