pandaboard_defconfig: bump u-boot to 2015.10 and kernel to 4.3

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+Pandaboard
+==========
+
+This file documents the Buildroot support for the Pandaboard, a
+low-power, low-cost single-board computer development platform based
+on the Texas Instruments OMAP4 system on a chip (SoC).
+
+Configuring and building Buildroot
+----------------------------------
+
+Start from the defconfig:
+
+  $ make pandaboard_defconfig
+
+You can edit build options the usual way:
+
+  $ make menuconfig
+
+When you are happy with the setup, run:
+
+  $ make
+
+The result of the build with the default settings should be these files:
+
+  output/images
+  ??? MLO
+  ??? omap4-panda-a4.dtb
+  ??? omap4-panda.dtb
+  ??? omap4-panda-es.dtb
+  ??? rootfs.ext2
+  ??? u-boot.img
+  ??? zImage
+
+Setting up your SD card
+-----------------------
+
+*Important*: pay attention which partition you are modifying so you don't
+accidentally erase the wrong file system, e.g your host computer or your
+external storage!
+
+In the default setup you need to create two partitions on your SD card:
+a boot partition and a rootfs partition.
+
+The ROM code from OMAP processors need the SD card to be formatted with
+a special geometry in the partition table. To do that, you can use the
+shell script below (this script was extracted from
+http://elinux.org/Panda_How_to_MLO_%26_u-boot).
+
+#!/bin/sh
+DRIVE=$1
+if [ -b "$DRIVE" ] ; then
+	dd if=/dev/zero of=$DRIVE bs=1024 count=1024
+	SIZE=`fdisk -l $DRIVE | grep Disk | awk '{print $5}'`
+	echo DISK SIZE - $SIZE bytes
+	CYLINDERS=`echo $SIZE/255/63/512 | bc`
+	echo CYLINDERS - $CYLINDERS
+	{
+	echo ,9,0x0C,*
+	echo ,,,-
+	} | sfdisk -D -H 255 -S 63 -C $CYLINDERS $DRIVE
+	mkfs.vfat -F 32 -n "boot" ${DRIVE}1
+	mke2fs -j -L "rootfs" ${DRIVE}2
+fi
+
+The next step is to mount the sdcard's first partition and copy MLO
+and u-boot.img to it.
+
+  $ sudo mkdir -p /mnt/sdcard
+  $ sudo mount /dev/sdX1 /mnt/sdcard
+  $ sudo cp MLO u-boot.img /mnt/sdcard
+  $ sudo umount /mnt/sdcard
+
+The last step is to copy the rootfs image to the sdcard's second
+partition using 'dd':
+
+  $ sudo dd if=rootfs.ext2 of=/dev/sdX2 bs=1M conv=fsync

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