zynq_zc706: bump Linux to xilinx-v2016.2

This is the latest release tag in the Xilinx repository, based on
Linux v4.4 in the mainline.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

configs/zynq_zc706_defconfig

@@ -2,13 +2,12 @@ BR2_arm=y
 BR2_cortex_a9=y
 BR2_ARM_ENABLE_VFP=y
 BR2_ARM_ENABLE_NEON=y
-# Linux headers same as kernel, a 3.14 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_14=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_4=y
 BR2_TARGET_GENERIC_GETTY_PORT="ttyPS0"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/Xilinx/linux-xlnx.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="xilinx-v2014.2.01"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="xilinx-v2016.2"
 BR2_LINUX_KERNEL_DEFCONFIG="xilinx_zynq"
 BR2_LINUX_KERNEL_UIMAGE=y
 BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x8000"