ath79: mtd-cal-data removals

Replacement can be done with nvmem.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

target/linux/ath79/dts/ar9331_embeddedwireless_dorin.dts

@@ -83,7 +83,7 @@
 				reg = <0x050000 0xfa0000>;
 			};
 
-			art: partition@ff0000 {
+			partition@ff0000 {
 				label = "art";
 				reg = <0xff0000 0x010000>;
 				read-only;
@@ -93,6 +93,10 @@
 					#address-cells = <1>;
 					#size-cells = <1>;
 
+					cal_art_1000: calibration@1000 {
+						reg = <0x1000 0x440>;
+					};
+
 					macaddr_art_1002: macaddr@1002 {
 						compatible = "mac-base";
 						reg = <0x1002 0x6>;
@@ -118,5 +122,6 @@
 &wmac {
 	status = "okay";
 
-	mtd-cal-data = <&art 0x1000>;
+	nvmem-cells = <&cal_art_1000>;
+	nvmem-cell-names = "calibration";
 };