configs: update cubieboard2 defconfig

This patch updates the Cubieboard2 board defconfig to use newer u-boot
and linux versions, along with a few other improvements.
The other improvements were mostly backported from the recent Orange Pi
defconfig inclusion and are related to image generation.
linux-sunxi.org was used as a reference for both linux and u-boot
defconfig names.

In detail:
- Update linux to vanilla upstream -- currently 4.3.3 is the most
up-to-date. Although it lacks some features present only in the
linux-sunxi 3.4 branch, upstream support appears to be relatively mature
and is already being deployed by default by distributions such as Arch
Linux ARM.
- Update u-boot to vanilla upstream 2015.10. According to
linux-sunxi.org, upstream fully supports major functions (except NAND)
since 2015.07.
- Change image format to zImage and drop custom image generation script
in favour of genimage, as pointed out by reviewers in the Orange Pi
defconfig submission.

This was tested in a Cubieboard2 board with boot from mmc and it boots
fine to login prompt.

This has not been tested in a Cubieboard (A10) as I don't own any; the
version bumps probably apply to it although there are some differences
(lack of VFPv4 support, Cortex-A8 instead of Cortex-A7), so I have kept
the current Cubieboard defconfig and its scripts. This one has been only
build-tested.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

configs/cubieboard2_defconfig

@@ -1,40 +1,30 @@
-# Architecture
 BR2_arm=y
 BR2_cortex_a7=y
-
-# System configuration
+BR2_ARM_FPU_NEON_VFPV4=y
+BR2_KERNEL_HEADERS_VERSION=y
+BR2_DEFAULT_KERNEL_VERSION="4.3.3"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_3=y
 BR2_TARGET_GENERIC_HOSTNAME="Cubieboard2"
-BR2_TARGET_GENERIC_ISSUE="Welcome to use Cubieboard!"
-BR2_TARGET_GENERIC_GETTY=y
+BR2_TARGET_GENERIC_ISSUE="Welcome to Cubieboard2!"
 BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"
-BR2_ROOTFS_POST_IMAGE_SCRIPT="board/cubietech/cubieboard/post-build.sh"
-
-# Additional tools
-BR2_PACKAGE_HOST_SUNXI_TOOLS=y
-BR2_PACKAGE_HOST_UBOOT_TOOLS=y
-BR2_PACKAGE_SUNXI_TOOLS=y
-BR2_PACKAGE_SUNXI_BOARDS=y
-BR2_PACKAGE_SUNXI_BOARDS_FEX_FILE="a20/cubieboard2.fex"
-
-# Kernel headers
-BR2_KERNEL_HEADERS_3_4=y
-
-# Kernel
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/cubietech/cubieboard2/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="board/cubietech/cubieboard2/post-image.sh"
 BR2_LINUX_KERNEL=y
-BR2_LINUX_KERNEL_CUSTOM_GIT=y
-BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/linux-sunxi/linux-sunxi.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="5dda5145c877335e17bd9ca48954841acc0f785a"
-BR2_LINUX_KERNEL_VERSION="sunxi-3.4"
-BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/cubietech/cubieboard/linux-cubieboard2.config"
-
-# Bootloaders
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.3.3"
+BR2_LINUX_KERNEL_DEFCONFIG="sunxi"
+BR2_LINUX_KERNEL_ZIMAGE=y
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="sun7i-a20-cubieboard2"
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
 BR2_TARGET_UBOOT=y
-BR2_TARGET_UBOOT_BOARDNAME="cubieboard2"
-BR2_TARGET_UBOOT_CUSTOM_GIT=y
-BR2_TARGET_UBOOT_VERSION="sunxi"
-BR2_TARGET_UBOOT_CUSTOM_REPO_URL="https://github.com/linux-sunxi/u-boot-sunxi.git"
-BR2_TARGET_UBOOT_CUSTOM_REPO_VERSION="b4bca5e0651b460a4511582f07a935cb48f74948"
-BR2_TARGET_UBOOT_FORMAT_BIN=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2015.10"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="Cubieboard2"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
 BR2_TARGET_UBOOT_SPL=y
 BR2_TARGET_UBOOT_SPL_NAME="u-boot-sunxi-with-spl.bin"
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y