ARM: sheevaplug: correct nand partition layout

Commit 1e3d640316 (ARM: sheevaplug: redefine MTDPARTS) changed the partition
layout (without any description why), but didn't change the offset/size to
load the kernel from or the root=/dev/mtdblockX in the bootargs.

The 3MB forseen for a kernel is furthermore too little. A 4.4 build of
mvebu_v5_defconfig is 3.6MB:

-rw-r--r-- 1 peko peko 3.6M Jan 16 20:24 uImage.kirkwood-sheevaplug

When device tree support for sheevaplug was added to the kernel in commit
ee514b381e (ARM: Kirkwood: Add dts files for Sheevaplug and eSATA
Sheevaplug) a default flash partition layout (used if mtdparts= isn't passed
on the command line / CONFIG_MTD_CMDLINE_PARTS isn't enabled) with 1MB for
u-boot / environment, 4MB for the kernel and the rest for the rootfs, so use
that layout here and adjust the kernel loading to match.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Stefan Roese <sr@denx.de>

include/configs/sheevaplug.h

@@ -64,12 +64,12 @@
 
 #define CONFIG_MTDPARTS		\
 	"orion_nand:512K(uboot),"				\
-	"512K(env),1M(script),6M(kernel),"				\
-	"12M(ramdisk),4M(spare),-(rootfs)\0"
+	"512K(env),4M(kernel),"					\
+	"-(rootfs)\0"
 
 #define CONFIG_EXTRA_ENV_SETTINGS	"x_bootargs=console"	\
 	"=ttyS0,115200 mtdparts="CONFIG_MTDPARTS	\
-	"x_bootcmd_kernel=nand read 0x6400000 0x100000 0x300000\0" \
+	"x_bootcmd_kernel=nand read 0x6400000 0x100000 0x400000\0" \
 	"x_bootcmd_usb=usb start\0" \
 	"x_bootargs_root=root=/dev/mtdblock3 rw rootfstype=jffs2\0"