edac: Create an unique instance for each kobj

Current code only works when there's just one memory
controller, since we need one kobj for each instance.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --cc drivers/edac/edac_core.h
Simple merge

diff --cc drivers/edac/edac_mc_sysfs.c
Simple merge