Bluetooth: hci_core: fix typos in macros

The provided macro parameter is named 'dev' (rather than 'hdev', which
may be a variable on the stack where the macro is used).

Fixes: a9a830a6 ("Bluetooth: hci_event: Fix sending HCI_OP_READ_ENC_KEY_SIZE")
Fixes: 6126ffab ("Bluetooth: Introduce HCI_CONN_FLAG_DEVICE_PRIVACY device flag")
Signed-off-by: Christian Eggers <ceggers@arri.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>