amd64_edac: Fix type usage in NB IDs and memory ranges

Use appropriate types for northbridge IDs and memory ranges. Mark
immutable data const and keep within compilation unit on related
structures.

Signed-off-by: Daniel J Blueman <daniel@numascale-asia.com>
Link: http://lkml.kernel.org/r/1354265060-22956-2-git-send-email-daniel@numascale-asia.com


[Boris: Drop arg change to node_to_amd_nb]
Signed-off-by: Borislav Petkov <bp@alien8.de>