ARM: AT91: update clock source registration

In d7e81c2 (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.

Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-at91/at91rm9200_time.c b/arch/arm/mach-at91/at91rm9200_time.c
index 2500f41..1dd69c8 100644
--- a/arch/arm/mach-at91/at91rm9200_time.c
+++ b/arch/arm/mach-at91/at91rm9200_time.c
@@ -101,7 +101,6 @@
 	.rating		= 150,
 	.read		= read_clk32k,
 	.mask		= CLOCKSOURCE_MASK(20),
-	.shift		= 10,
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
@@ -201,8 +200,7 @@
 	clockevents_register_device(&clkevt);
 
 	/* register clocksource */
-	clk32k.mult = clocksource_hz2mult(AT91_SLOW_CLOCK, clk32k.shift);
-	clocksource_register(&clk32k);
+	clocksource_register_hz(&clk32k, AT91_SLOW_CLOCK);
 }
 
 struct sys_timer at91rm9200_timer = {