Use correct HCI ISO data packet header struct when the packet has
timestamp. The timestamp, when present, goes before the other fields
(Core v5.3 4E 5.4.5), so the structs are not compatible.

Fixes: ccf74f23 ("Bluetooth: Add BTPROTO_ISO socket type")
Signed-off-by: NPauli Virtanen <pav@iki.fi>
Signed-off-by: NLuiz Augusto von Dentz <luiz.von.dentz@intel.com>