of/edac: fix build breakage in drivers

Fixes build errors in EDAC drivers caused by the OF
device_node pointer being moved into struct device

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/edac/ppc4xx_edac.c b/drivers/edac/ppc4xx_edac.c
index 9d6f678..e78839e 100644
--- a/drivers/edac/ppc4xx_edac.c
+++ b/drivers/edac/ppc4xx_edac.c
@@ -1022,7 +1022,7 @@
 	int status = 0;
 	const u32 memcheck = (mcopt1 & SDRAM_MCOPT1_MCHK_MASK);
 	struct ppc4xx_edac_pdata *pdata = NULL;
-	const struct device_node *np = op->node;
+	const struct device_node *np = op->dev.of_node;
 
 	if (match == NULL)
 		return -EINVAL;
@@ -1113,7 +1113,7 @@
 	int status = 0;
 	int ded_irq, sec_irq;
 	struct ppc4xx_edac_pdata *pdata = mci->pvt_info;
-	struct device_node *np = op->node;
+	struct device_node *np = op->dev.of_node;
 
 	ded_irq = irq_of_parse_and_map(np, INTMAP_ECCDED_INDEX);
 	sec_irq = irq_of_parse_and_map(np, INTMAP_ECCSEC_INDEX);
@@ -1243,7 +1243,7 @@
 	int status = 0;
 	u32 mcopt1, memcheck;
 	dcr_host_t dcr_host;
-	const struct device_node *np = op->node;
+	const struct device_node *np = op->dev.of_node;
 	struct mem_ctl_info *mci = NULL;
 	static int ppc4xx_edac_instance;