asm/do_div.h is for div_u64, but it is found in math64.h. This change
will make compiler job easier and prevent compiler errors in situation
where compiler will not find math64.h from another paths.
Signed-off-by: Kari Argillander <kari.argillander@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>