ath79: mtd-cal-data removals

Replacement can be done with nvmem.

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

target/linux/ath79/dts/qca9557_8dev_rambutan.dts

@@ -41,7 +41,7 @@
 			reg = <0x300000 0x200000>;
 		};
 
-		art: partition@500000 {
+		partition@500000 {
 			label = "art";
 			reg = <0x500000 0x100000>;
 			read-only;
@@ -58,6 +58,10 @@
 				macaddr_art_6: macaddr@6 {
 					reg = <0x6 0x6>;
 				};
+
+				cal_art_1000: calibration@1000 {
+					reg = <0x1000 0x440>;
+				};
 			};
 		};
 
@@ -111,7 +115,9 @@
 	status = "okay";
 
 	gpio-controller;
-	mtd-cal-data = <&art 0x1000>;
+
+	nvmem-cells = <&cal_art_1000>;
+	nvmem-cell-names = "calibration";
 };
 
 &pcie0 {