MIPS: cevt-r4k: Migrate to new 'set-state' interface

Migrate cevt-4k driver to the new 'set-state' interface provided by
clockevents core, the earlier 'set-mode' interface is marked obsolete
now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

We weren't doing anything in the ->set_mode() callback. So, this patch
doesn't provide any set-state callbacks.

Signed-off-by: Viresh Kumar <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: Andrew Bresticker <[e-mail]>
Cc: Qais Yousef <[e-mail]>
Cc: Jason Cooper <[e-mail]>
Cc: Leonid Yegoshin <[e-mail]>
Cc: Daniel Lezcano <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: Thomas Gleixner <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/10605/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/include/asm/cevt-r4k.h

···
 
 void mips_event_handler(struct clock_event_device *dev);
 int c0_compare_int_usable(void);
-void mips_set_clock_mode(enum clock_event_mode, struct clock_event_device *);
 irqreturn_t c0_compare_interrupt(int, void *);
 
 extern struct irqaction c0_compare_irqaction;

arch/mips/kernel/cevt-r4k.c

···
 	return res;
 }
 
-void mips_set_clock_mode(enum clock_event_mode mode,
-				struct clock_event_device *evt)
-{
-	/* Nothing to do ...  */
-}
-
 DEFINE_PER_CPU(struct clock_event_device, mips_clockevent_device);
 int cp0_timer_irq_installed;
 
···
 	cd->irq			= irq;
 	cd->cpumask		= cpumask_of(cpu);
 	cd->set_next_event	= mips_next_event;
-	cd->set_mode		= mips_set_clock_mode;
 	cd->event_handler	= mips_event_handler;
 
 	clockevents_register_device(cd);