• Move the check for too high HZ values from tick_init() to tick_start() as we have to call tick_init() before cninit() in order to provide the low-level console drivers with a working DELAY() which in turn means we cannot use panic() in tick_init().
• s,to high, too high, in the panic string

Inspired by: kmacy's sun4v changes
MFC after: 3 days