configs/qemu: update aarch64 to linux 4.6.3

The console problem goes away with qemu 2.6.0 so it seems it's now a
requirement, update readme.txt accordingly.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/qemu/aarch64-virt/readme.txt

@@ -4,4 +4,4 @@ Run the emulation with:
 
 The login prompt will appear in the terminal that started Qemu.
 
-Tested with QEMU 2.5.0
+Tested with QEMU 2.6.0

configs/qemu_aarch64_virt_defconfig

@@ -9,12 +9,12 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
 # BR2_TARGET_ROOTFS_TAR is not set
 BR2_TARGET_ROOTFS_INITRAMFS=y
 
-# Linux headers same as kernel, a 4.5 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_5=y
+# Linux headers same as kernel, a 4.6 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_6=y
 
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.5.6"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.6.3"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux-4.5.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux-4.6.config"