Bluetooth: btintel: Fix existing sparce warnings

This fix the following warnings detect with make W=1 C=1:

drivers/bluetooth/btintel.c:1041:38: warning: cast to restricted __le32
drivers/bluetooth/btintel.c:1786:25: warning: cast to restricted __le16
drivers/bluetooth/btintel.c:1795:25: warning: cast to restricted __le16
drivers/bluetooth/btintel.c:1796:25: warning: cast to restricted __le16
drivers/bluetooth/btintel.c:1797:25: warning: cast to restricted __le16

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>