qemu/arm-versatile: update to use kernel 3.8.8

The IRQ mapping failures have been fixed in 3.8.8 so update it to the
latest kernel series.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

configs/qemu_arm_versatile_defconfig

@@ -11,12 +11,12 @@ BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set
 
 # Lock to 3.7 headers to avoid breaking with newer kernels
-BR2_KERNEL_HEADERS_3_7=y
+BR2_KERNEL_HEADERS_3_8=y
 
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.7.10"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="3.8.8"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/arm-versatile/linux-3.7.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/arm-versatile/linux-3.8.config"
 BR2_LINUX_KERNEL_ZIMAGE=y