EDAC, sb_edac: Add Knights Mill support

Add Knights Mill (KNM) to the list of CPU models supported by sb_edac.

Signed-off-by: Piotr Luc <piotr.luc@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20161013153105.2517-6-piotr.luc@intel.com


Signed-off-by: Borislav Petkov <bp@suse.de>