EDAC, sb_edac: Add support for systems with segmented PCI buses

Extend the driver to check whether segment number and bus number matches
when deciding how to group memory controller PCI devices to CPU sockets.

Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20180724190213.26359-1-msys.mizuma@gmail.com


[ Cleanup commit message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>