orange-pi-zero: bump kernel version

Bump kernel and kernel headers to 4.13.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/orangepi_zero_defconfig

@@ -2,14 +2,14 @@ BR2_arm=y
 BR2_cortex_a7=y
 BR2_ARM_FPU_VFPV4=y
 BR2_GLOBAL_PATCH_DIR="board/orangepi/orangepi-zero/patches"
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_11=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_13=y
 BR2_TARGET_GENERIC_HOSTNAME="OrangePi_Zero"
 BR2_TARGET_GENERIC_ISSUE="Welcome to Buildroot for the Orange Pi Zero"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/orangepi/orangepi-zero/post-build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="board/orangepi/orangepi-zero/post-image.sh"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.11"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.13"
 BR2_LINUX_KERNEL_DEFCONFIG="sunxi"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="sun8i-h2-plus-orangepi-zero"