cmd_dhry.c: Use lldiv for vax_mips calculation as well

Since dhry_per_sec is a u64 we must also use lldiv here when working
with it.  Otherwise:
../lib/dhry/cmd_dhry.c:(.text.do_dhry+0xd8): undefined reference to `__udivdi3'

On some platforms.

Signed-off-by: Tom Rini <trini@konsulko.com>

lib/dhry/cmd_dhry.c

@@ -22,7 +22,7 @@ static int do_dhry(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	dhry(iterations);
 	duration = get_timer(start);
 	dhry_per_sec = lldiv(iterations * 1000ULL, duration);
-	vax_mips = dhry_per_sec / 1757;
+	vax_mips = lldiv(dhry_per_sec, 1757);
 	printf("%d iterations in %lu ms: %lu/s, %lu DMIPS\n", iterations,
 	       duration, (ulong)dhry_per_sec, vax_mips);