qemu/x86: update to the latest versions

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

board/qemu/x86/readme.txt

@@ -4,4 +4,4 @@ Run the emulation with:
 
 The login prompt will appear in the graphical window.
 
-Tested with QEMU 2.1.0
+Tested with QEMU 2.1.2

configs/qemu_x86_defconfig

@@ -10,14 +10,14 @@ BR2_TARGET_GENERIC_GETTY_PORT="tty1"
 BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set
 
-# Lock to 3.16 headers to avoid breaking with newer kernels
+# Lock to 3.17 headers to avoid breaking with newer kernels
 BR2_KERNEL_HEADERS_VERSION=y
-BR2_DEFAULT_KERNEL_VERSION="3.16.3"
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_16=y
+BR2_DEFAULT_KERNEL_VERSION="3.17"
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_17=y
 
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.16.3"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.17"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86/linux-3.16.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86/linux-3.17.config"