rampis: mt7621: Convert Edgerouter-X dts to single kernel config

The OEM layout for Edgerouter X provides for two 3MB kernel slots.
As of linux 6.1 the kernel images no longer fit and as such
Edgerouter X builds have been disabled in Main.

Revise the layout to make kernel1 slot 6MB and drop kernel2 slot.

This patch applies the required changes to the dts file.

Signed-off-by: Tim Lunn <[email protected]>
Tested-by: Mauri Sandberg <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15194
Signed-off-by: Petr Štetiar <[email protected]>

target/linux/ramips/dts/mt7621_ubnt_edgerouter-x.dtsi

@@ -100,13 +100,8 @@
 		};
 
 		partition@140000 {
-			label = "kernel1";
-			reg = <0x140000 0x300000>;
-		};
-
-		partition@440000 {
-			label = "kernel2";
-			reg = <0x440000 0x300000>;
+			label = "kernel";
+			reg = <0x140000 0x600000>;
 		};
 
 		partition@740000 {