i7core_edac: Fix compilation on 32 bits arch

on i386:
	ERROR: "__udivdi3" [drivers/edac/i7core_edac.ko] undefined!\

In both get_sdram_scrub_rate() and set_sdram_scrub_rate()
Reported-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/edac/i7core_edac.c

@@ -37,6 +37,7 @@
 #include <linux/smp.h>
 #include <asm/mce.h>
 #include <asm/processor.h>
+#include <asm/div64.h>
 
 #include "edac_core.h"
 
@@ -2102,7 +2103,8 @@ static int set_sdram_scrub_rate(struct mem_ctl_info *mci, u32 new_bw)
 		 * program the corresponding register value.
 		 */
 		scrub_interval = (unsigned long long)freq_dclk_mhz *
-			cache_line_size * 1000000 / new_bw;
+			cache_line_size * 1000000;
+		do_div(scrub_interval, new_bw);
 
 		if (!scrub_interval || scrub_interval > SCRUBINTERVAL_MASK)
 			return -EINVAL;
@@ -2153,7 +2155,8 @@ static int get_sdram_scrub_rate(struct mem_ctl_info *mci)
 
 	/* Calculate scrub rate value into byte/sec bandwidth */
 	scrub_rate =  (unsigned long long)freq_dclk_mhz *
-		1000000 * cache_line_size / scrubval;
+		1000000 * cache_line_size;
+	do_div(scrub_rate, scrubval);
 	return (int)scrub_rate;
 }