qemu/x86_64: update to use kernel 3.4.7

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

board/qemu/x86_64/readme.txt

@@ -3,3 +3,5 @@ Run the emulation with:
   qemu-system-x86_64 -M pc -kernel output/images/bzImage -drive file=output/images/rootfs.ext2,if=ide -append root=/dev/sda
 
 The login prompt will appear in the graphical window.
+
+Tested with QEMU 1.1.1

configs/qemu_x86_64_defconfig

@@ -9,12 +9,12 @@ BR2_TARGET_GENERIC_GETTY_PORT="tty1"
 BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set
 
-# Lock to 3.3 headers to avoid breaking with newer kernels
-BR2_KERNEL_HEADERS_3_3=y
+# Lock to 3.4 headers to avoid breaking with newer kernels
+BR2_KERNEL_HEADERS_3_4=y
 
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.3.7"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.4.7"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86_64/linux-3.3.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/x86_64/linux-3.4.config"