ath79: WNDR4300: increase kernel partition to 4M

Increase kernel partition from 2 MiB to 4 MiB for Netgear WNDR routers
with NAND flash. Change affects following devices:
 * Netgear WNDR3700 v4
 * Netgear WNDR4300

Signed-off-by: Michal Cieslakiewicz <michal.cieslakiewicz@wp.pl>

target/linux/ath79/dts/ar9344_netgear_wndr.dtsi

@@ -106,9 +106,9 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 
-			ubi@8c0000 {
+			ubi@ac0000 {
 				label = "ubi";
-				reg = <0x0 0x7700000>;
+				reg = <0x0 0x7500000>;
 			};
 		};
 	};
@@ -167,12 +167,12 @@
 
 		kernel@6c0000 {
 			label = "kernel";
-			reg = <0x6c0000 0x200000>;
+			reg = <0x6c0000 0x400000>;
 		};
 
-		ubipart0: partition@8c0000 {
+		ubipart0: partition@ac0000 {
 			label = "ubipart0";
-			reg = <0x8c0000 0x1700000>;
+			reg = <0xac0000 0x1500000>;
 		};
 
 		partition@6c0000 {

target/linux/ath79/image/nand.mk

@@ -114,7 +114,7 @@ TARGET_DEVICES += glinet_gl-ar750s-nor
 define Device/netgear_ath79_nand
   DEVICE_VENDOR := NETGEAR
   DEVICE_PACKAGES := kmod-usb2 kmod-usb-ledtrig-usbport
-  KERNEL_SIZE := 2048k
+  KERNEL_SIZE := 4096k
   BLOCKSIZE := 128k
   PAGESIZE := 2048
   IMAGE_SIZE := 25600k