qemu/arm-versatile: roll back to 3.11.x kernel series

As pointed by Thomas P. kernel 3.12 oopses when loading/using the
emulated network.
Seems 3.12 broke versatile for qemu like in the past, only in a more
subtle way this time that escaped my automated qemu builds/tests.

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

configs/qemu_arm_versatile_defconfig

@@ -10,14 +10,14 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
 BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set
 
-# Lock to 3.12 headers to avoid breaking with newer kernels
+# Lock to 3.11 headers to avoid breaking with newer kernels
 BR2_KERNEL_HEADERS_VERSION=y
-BR2_DEFAULT_KERNEL_VERSION="3.12"
+BR2_DEFAULT_KERNEL_VERSION="3.11.8"
 
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.12"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.11.8"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/arm-versatile/linux-3.12.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/arm-versatile/linux-3.11.config"
 BR2_LINUX_KERNEL_ZIMAGE=y