ARM: plat-nomadik: use DIV_ROUND_CLOSEST()

Use DIV_ROUND_CLOSEST() to calculate the cycle counter for the
periodic mode instead of relying on homebrew reimplementation.

Cc: Alessandro Rubini <rubini@unipv.it>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/plat-nomadik/timer.c

@@ -201,7 +201,8 @@ void __init nmdk_timer_init(void __iomem *base, int irq)
 		clk_prescale = MTU_CRn_PRESCALE_1;
 	}
 
-	nmdk_cycle = (rate + HZ/2) / HZ;
+	/* Cycles for periodic mode */
+	nmdk_cycle = DIV_ROUND_CLOSEST(rate, HZ);
 
 
 	/* Timer 0 is the free running clocksource */