qemu/arm-vexpress: 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/arm-vexpress/readme.txt

@@ -4,3 +4,5 @@ Run the emulation with:
 
 The login prompt will appear in the terminal that started Qemu. The
 graphical window is the framebuffer.
+
+Tested with QEMU 1.1.1

configs/qemu_arm_vexpress_defconfig

@@ -11,12 +11,12 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
 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_DEFCONFIG="vexpress"
 BR2_LINUX_KERNEL_ZIMAGE=y