qemu-xtensa: Update to latest stable kernel

Update to Linux 3.16.3.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/qemu/xtensa-lx60/readme.txt

@@ -4,4 +4,4 @@ Run the emulation with:
 
 The login prompt will appear in the terminal that started Qemu.
 
-Tested with QEMU 2.0.0
+Tested with QEMU 2.1.0

configs/qemu_xtensa_lx60_defconfig

@@ -16,15 +16,15 @@ BR2_TARGET_ROOTFS_INITRAMFS=y
 
 # Lock to 3.15 headers to avoid breaking with newer kernels
 BR2_KERNEL_HEADERS_VERSION=y
-BR2_DEFAULT_KERNEL_VERSION="3.15.5"
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_15=y
+BR2_DEFAULT_KERNEL_VERSION="3.16.3"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_16=y
 
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.15.5"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.16.3"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/xtensa-lx60/linux-3.15.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/xtensa-lx60/linux-3.16.config"
 BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
 BR2_LINUX_KERNEL_IMAGE_NAME="Image.elf"
 BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="zImage"