edac: only create sdram_scrub_rate where supported
Currently, sdram_scrub_rate sysfs node is created even if the device doesn't support get/set the scub rate. Change the logic to only create this device node when the operation is supported. Reported-by: Felipe Balbi <balbi@ti.com> Acked-by: Borislav Petkov <bp@suse.de> Reviewed-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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