The dropbear init script uses pidof, but BusyBox may be built
without it. Add a Kconfig dependency on BUSYBOX_CONFIG_PIDOF
to ensure the applet is available at runtime.
Signed-off-by: Ivan Romanov <drizt72@zoho.eu>
Link: https://github.com/openwrt/openwrt/pull/23128
Signed-off-by: Robert Marko <robimarko@gmail.com>