ramips: dts: fix incorrect flash reg property

Most work was done in commit 021c8936584d ("ramips: fix size-cells on spi
nodes"), but a few more DTS files using the old reg style have been added
since then. This commit fixes them.

Signed-off-by: Sungbo Eo <[email protected]>

target/linux/ramips/dts/mt7620a_aigale_ai-br100.dts

@@ -54,7 +54,7 @@
 
 	flash@0 {
 		compatible = "jedec,spi-nor";
-		reg = <0 0>;
+		reg = <0>;
 		spi-max-frequency = <10000000>;
 
 		partitions {

target/linux/ramips/dts/mt7620a_edimax_br-6478ac-v2.dts

@@ -89,7 +89,7 @@
 
 	flash@0 {
 		compatible = "jedec,spi-nor";
-		reg = <0 0>;
+		reg = <0>;
 		spi-max-frequency = <10000000>;
 
 		partitions {

target/linux/ramips/dts/mt7621_mediatek_ap-mt7621a-v60.dts

@@ -79,7 +79,7 @@
 
 	flash@0 {
 		compatible = "mx25l6405d","jedec,spi-nor";
-		reg = <0 0>;
+		reg = <0>;
 		spi-max-frequency = <10000000>;
 
 		partitions {

target/linux/ramips/dts/mt7628an_mercury_mac1200r-v2.dts

@@ -35,7 +35,7 @@
 
 	flash@0 {
 		compatible = "jedec,spi-nor";
-		reg = <0 0>;
+		reg = <0>;
 		spi-max-frequency = <10000000>;
 
 		partitions {

target/linux/ramips/dts/rt3352_zyxel_nbg-419n-v2.dts

@@ -64,7 +64,7 @@
 
 	flash@0 {
 		compatible = "jedec,spi-nor";
-		reg = <0 0>;
+		reg = <0>;
 		spi-max-frequency = <10000000>;
 
 		partitions {