inteltool: fixed 64 bit build

inteltool: fixed 64 bit build

The inline assembly for cpuid() was 32 bit specific. Additionally a
format string referencing a size_t argument wasn't using the %z length
modifier.

Change-Id: Iac4a4d5ca81f9bf67bb7b8772013bf6c289e4301
Signed-off-by: Mathias Krause <mathias.krause@secunet.com>
Reviewed-on: http://review.coreboot.org/211
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marcj303@gmail.com>