ar71xx: image: simplify mynet_n600_mtdlayout

Remove the kernel and rootfs partitions. The Seama
parser can find those automatically:

  0x000000070000-0x000000ff0000 : "firmware"
  2 seama-fw partitions found on MTD device firmware
  0x000000070000-0x0000001b0000 : "kernel"
  0x0000001b0000-0x000000ff0000 : "rootfs"
  mtd: partition "rootfs" set to be root filesystem
  1 squashfs-split partitions found on MTD device rootfs
  0x000000360000-0x000000ff0000 : "rootfs_data"
  0x000000ff0000-0x000001000000 : "radiocfg"

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 38155

target/linux/ar71xx/image/Makefile

@@ -200,7 +200,7 @@ wndr3700_mtdlayout=mtdparts=spi0.0:320k(u-boot)ro,128k(u-boot-env)ro,7680k(firmw
 wndr3700v2_mtdlayout=mtdparts=spi0.0:320k(u-boot)ro,128k(u-boot-env)ro,15872k(firmware),64k(art)ro
 wndr4300_mtdlayout=mtdparts=ar934x-nfc:256k(u-boot)ro,256k(u-boot-env)ro,256k(caldata),512k(pot),2048k(language),512k(config),3072k(traffic_meter),1152k(kernel),24448k(rootfs),25600k@0x6c0000(firmware),256k(caldata_backup),-(reserved)
 zcn1523h_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,6208k(rootfs),1472k(kernel),64k(configure)ro,64k(mfg)ro,64k(art)ro,7680k@0x50000(firmware)
-mynet_n600_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,64k(devdata)ro,64k(devconf)ro,1280k(kernel),14592k(rootfs),64k(radiocfg)ro,15872k@0x70000(firmware)
+mynet_n600_mtdlayout=mtdparts=spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,64k(devdata)ro,64k(devconf)ro,15872k(firmware),64k(radiocfg)ro
 
 define Image/BuildKernel
 	cp $(KDIR)/vmlinux.elf $(VMLINUX).elf