config: added new 'kvmsmall' flavor
    
    This flavor is intended for kernel developers to use in simple virtual
    machines.  It contains only the device drivers necessary to use a
    KVM virtual machine *without* device passthrough enabled.  Common
    local and network file systems are enabled.  All device mapper targets
    are enabled.  Only the network and graphics drivers for devices that qemu
    emulates are enabled.  Many subsystems enabled in the default kernel
    are entirely disabled.  This kernel is meant to be small and to build
    very quickly.