ARM: stmp: update clock source registration

In d7e81c26 (clocksource: Add clocksource_register_hz/khz interface) new
interfaces were added which simplify (and optimize) the selection of the
divisor shift/mult constants.  Switch over to using this new interface.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/plat-stmp3xxx/timer.c

@@ -89,7 +89,6 @@ static struct clocksource cksrc_stmp3xxx = {
 	.rating         = 250,
 	.read           = stmp3xxx_clock_read,
 	.mask           = CLOCKSOURCE_MASK(16),
-	.shift          = 10,
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
@@ -106,8 +105,6 @@ static struct irqaction stmp3xxx_timer_irq = {
  */
 static void __init stmp3xxx_init_timer(void)
 {
-	cksrc_stmp3xxx.mult = clocksource_hz2mult(CLOCK_TICK_RATE,
-				cksrc_stmp3xxx.shift);
 	ckevt_timrot.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC,
 				ckevt_timrot.shift);
 	ckevt_timrot.min_delta_ns = clockevent_delta2ns(2, &ckevt_timrot);
@@ -140,7 +137,7 @@ static void __init stmp3xxx_init_timer(void)
 
 	setup_irq(IRQ_TIMER0, &stmp3xxx_timer_irq);
 
-	clocksource_register(&cksrc_stmp3xxx);
+	clocksource_register_hz(&cksrc_stmp3xxx, CLOCK_TICK_RATE);
 	clockevents_register_device(&ckevt_timrot);
 }