configs: cubieboard2: correct genimage dependencies

The genimage configuration creates a vfat filesystem, so ensure we have
dosfstools / mtools built for the host.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/cubieboard2_defconfig

@@ -25,5 +25,7 @@ BR2_TARGET_UBOOT_BOARD_DEFCONFIG="Cubieboard2"
 BR2_TARGET_UBOOT_NEEDS_DTC=y
 BR2_TARGET_UBOOT_SPL=y
 BR2_TARGET_UBOOT_SPL_NAME="u-boot-sunxi-with-spl.bin"
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y
 BR2_PACKAGE_HOST_UBOOT_TOOLS=y