MIPS: Use DIV_ROUND_CLOSEST

The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d
but is perhaps more readable.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@haskernel@
@@

#include <linux/kernel.h>

@depends on haskernel@
expression x,__divisor;
@@

- (((x) + ((__divisor) / 2)) / (__divisor))
+ DIV_ROUND_CLOSEST(x,__divisor)
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/nxp/pnx8550/common/time.c

@@ -138,7 +138,7 @@ __init void plat_time_init(void)
 	 * HZ timer interrupts per second.
 	 */
 	mips_hpt_frequency = 27UL * ((1000000UL * n)/(m * pow2p));
-	cpj = (mips_hpt_frequency + HZ / 2) / HZ;
+	cpj = DIV_ROUND_CLOSEST(mips_hpt_frequency, HZ);
 	write_c0_count(0);
 	timer_ack();