x86/mm: Use early_memunmap() instead of early_iounmap()

Memory mapped via early_memremap() should be unmapped with
early_memunmap() instead of early_iounmap().

Signed-off-by: Juergen Gross <jgross@suse.com>
Cc: matt.fleming@intel.com
Link: http://lkml.kernel.org/r/1424769211-11378-2-git-send-email-jgross@suse.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>