EDAC: Fix csrow size reported in sysfs

On csrow-based memory controllers, we combine the csrow size from both
channels and there's no need to do that again in csrow_size_show which
leads to double the size of a csrow.

Fix it.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 307ff66..f74a684 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2174,6 +2174,7 @@
 			dimm->edac_mode = edac_mode;
 			dimm->nr_pages = nr_pages;
 		}
+		csrow->nr_pages = nr_pages;
 	}
 
 	return empty;