configs/mini2440_defconfig: remove defconfig

This defconfig has not been updated in any significant way since 2011,
when Peter moved it to use a mainline kernel. It's now using an
ancient 3.0 kernel, and a vendor-specific U-Boot version that fails to
build with various "undefined reference" errors:

  undefined reference to `show_boot_progress'
  undefined reference to `image_print_contents'
  undefined reference to `wait_ms'

So it's time to get rid of the defconfig for this platform.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

configs/mini2440_defconfig

@@ -1,34 +0,0 @@
-# Architecture
-BR2_arm=y
-BR2_arm920t=y
-
-# Serial port
-BR2_TARGET_GENERIC_GETTY=y
-BR2_TARGET_GENERIC_GETTY_PORT="ttySAC0"
-
-# Filesystem
-BR2_TARGET_ROOTFS_JFFS2=y
-BR2_TARGET_ROOTFS_JFFS2_NANDFLASH_128K=y
-BR2_TARGET_ROOTFS_JFFS2_PAGESIZE=0x800
-BR2_TARGET_ROOTFS_JFFS2_EBSIZE=0x20000
-BR2_TARGET_ROOTFS_JFFS2_NOCLEANMARKER=y
-BR2_TARGET_ROOTFS_JFFS2_LE=y
-BR2_TARGET_ROOTFS_TAR=y
-
-# Linux headers same as kernel, a 3.0 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_0=y
-
-# Bootloader
-BR2_TARGET_UBOOT=y
-BR2_TARGET_UBOOT_BOARDNAME="mini2440"
-BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
-BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="http://repo.or.cz/w/u-boot-openmoko/mini2440.git/snapshot/dev-mini2440-stable.tar.gz"
-
-#
-# Kernel
-#
-BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.0.4"
-BR2_LINUX_KERNEL_DEFCONFIG="mini2440"
-BR2_LINUX_KERNEL_UIMAGE=y