Bad page information should not be exposed by sysfs when
bad page retirement is disabled, so decouple it from ras
sysfs group creating, and add one guard before creating.
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>