EDAC, thunderx: Change LMC index calculation

Shift the node number by 3 bits instead of 8 allowing proper functioning
with default EDAC_MAX_MCS.

Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Jan.Glauber@cavium.com
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170406113755.17082-1-s.temerkhanov@gmail.com


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