[media] fc2580: use macro for 64 bit division and reminder

Fixes the following warnings on a 32 bit system with GCC 4.4.3 and kernel Ubuntu 2.6.32-43 32 bit:
WARNING: "__udivdi3" [fc2580.ko] undefined!
WARNING: "__umoddi3" [fc2580.ko] undefined!
Signed-off-by: Gianluca Gennari <gennarone@gmail.com>
Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/tuners/fc2580.c

@@ -168,8 +168,7 @@ static int fc2580_set_params(struct dvb_frontend *fe)
 	}
 
 	f_ref = 2UL * priv->cfg->clock / r_val;
-	n_val = f_vco / f_ref;
-	k_val = f_vco % f_ref;
+	n_val = div_u64_rem(f_vco, f_ref, &k_val);
 	k_val_reg = 1UL * k_val * (1 << 20) / f_ref;
 
 	ret = fc2580_wr_reg(priv, 0x18, r18_val | ((k_val_reg >> 16) & 0xff));