Bluetooth: hci_nokia: use skb_put_padto()

skb_pad() does not change skb->len, callers have to follow it
with skb_put(), which is error prone.

Use skb_put_padto() instead of the open-coded sequence in
nokia_enqueue().

Signed-off-by: Eric Dumazet <edumazet@kernel.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>