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>

include/linux/edac.h

@@ -533,6 +533,7 @@ struct csrow_info {
 
 	u32 ue_count;		/* Uncorrectable Errors for this csrow */
 	u32 ce_count;		/* Correctable Errors for this csrow */
+	u32 nr_pages;		/* combined pages count of all channels */
 
 	struct mem_ctl_info *mci;	/* the parent */