- 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
- 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

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