defconfigs: bump minnowboard-max kernel to 3.18.1

BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"

BR2_ROOTFS_POST_BUILD_SCRIPT="board/minnowboard-max/post-build.sh"

# Lock to 3.17 headers to avoid breaking with newer kernels

# Lock to 3.18 headers to avoid breaking with newer kernels

BR2_KERNEL_HEADERS_VERSION=y

BR2_DEFAULT_KERNEL_VERSION="3.17.2"

BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_17=y

BR2_DEFAULT_KERNEL_VERSION="3.18.1"

BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_18=y

# Needed for ethernet

BR2_PACKAGE_LINUX_FIRMWARE=y

# Linux kernel

BR2_LINUX_KERNEL=y

BR2_LINUX_KERNEL_CUSTOM_VERSION=y

BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.17.2"

BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.18.1"

BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y

BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/minnowboard-max/linux-3.17.config"

BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/minnowboard-max/linux-3.18.config"

# Bootloader

BR2_TARGET_GRUB2=y