This commit removes `bt_hci_evt_get_flags`, and the associated flag
symbols. These symbols no longer serve a purpose in the driver interface
after the removal of `bt_recv_prio` from the interface.
The implementation of `bt_hci_evt_get_flags` is distributed to its
still-existing use sites, `hci_core` and the `hci_driver` in the
controller.
The duplication of code is intentional. This is no longer part of any
interface, and the host-developers expect the host copy of the function
to change or dissapear entierly. This will allow the host implementation
to progress without fear of breaking the controller implementation.
Signed-off-by: Aleksander Wasaznik <aleksander.wasaznik@nordicsemi.no>
171363501a