mikrotik: make soft_config writable

Parent mtd partition needs to be writable

Signed-off-by: Oskari Lemmela <oskari@lemmela.net>

target/linux/ath79/dts/ar9344_mikrotik_routerboard-sxt-5n.dtsi

@@ -99,7 +99,6 @@
 			partition@0 {
 				label = "RouterBoot";
 				reg = <0x0 0x20000>;
-				read-only;
 				compatible = "mikrotik,routerboot-partitions";
 				#address-cells = <1>;
 				#size-cells = <1>;

target/linux/ath79/dts/qca9533_mikrotik_routerboard-16m.dtsi

@@ -38,7 +38,6 @@
 			partition@0 {
 				label = "RouterBoot";
 				reg = <0x0 0x20000>;
-				read-only;
 				compatible = "mikrotik,routerboot-partitions";
 				#address-cells = <1>;
 				#size-cells = <1>;

target/linux/ath79/dts/qca9556_mikrotik_routerboard-wap-g-5hact2hnd.dts

@@ -73,7 +73,6 @@
 			partition@0 {
 				label = "RouterBoot";
 				reg = <0x0 0x20000>;
-				read-only;
 				compatible = "mikrotik,routerboot-partitions";
 				#address-cells = <1>;
 				#size-cells = <1>;

target/linux/ramips/dts/mt7621_mikrotik.dtsi

@@ -37,7 +37,6 @@
 			partition@0 {
 				label = "RouterBoot";
 				reg = <0x0 0x40000>;
-				read-only;
 				compatible = "mikrotik,routerboot-partitions";
 				#address-cells = <1>;
 				#size-cells = <1>;