odroidxu4: use zImage kernel rather than uImage

Author: ccrisan

configs/odroidxu4_defconfig

@@ -4,7 +4,7 @@ BR2_ARM_EABIHF=y
 BR2_ARM_FPU_NEON_VFPV4=y
 BR2_DL_DIR="$(TOPDIR)/.download"
 BR2_CCACHE=y
-BR2_CCACHE_DIR="$(TOPDIR)/.buildroot-ccache-odroidxu4"
+BR2_CCACHE_DIR="$(TOPDIR)/.buildroot-ccache-odroidxu3"
 BR2_OPTIMIZE_2=y
 BR2_TOOLCHAIN_EXTERNAL=y
 BR2_TARGET_OPTIMIZATION="-pipe"
@@ -13,13 +13,14 @@ BR2_TARGET_GENERIC_ISSUE=""
 BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
 BR2_ROOTFS_SKELETON_CUSTOM=y
 BR2_ROOTFS_SKELETON_CUSTOM_PATH="board/common/skeleton"
-BR2_ROOTFS_OVERLAY="board/common/overlay board/odroidxu4/overlay"
+BR2_ROOTFS_OVERLAY="board/common/overlay board/odroidxu3/overlay"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/common/postscript.sh"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
 BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="https://github.com/hardkernel/linux/archive/8475a30f84c3cb15192aa19dc3b21fe5e124c51c.tar.gz"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/odroidxu4/kernel.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/odroidxu3/kernel.config"
+BR2_LINUX_KERNEL_ZIMAGE=y
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="exynos5422-odroidxu3"
 BR2_PACKAGE_BUSYBOX_CONFIG="board/common/busybox-1.22.x.config"