Install the callbacks via the state machine.

[ tglx: Renamed the state to MIPS_SOC_PREPARE so it can be reused by other
  	SOCs ]
Signed-off-by: NSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: NRalf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-16-bigeasy@linutronix.deSigned-off-by: NThomas Gleixner <tglx@linutronix.de>