tests: Bluetooth: df: Fix not building connection CTE req tests

The tests for direction finding connected mode were not building
correclty. There were missing Kconfig options that enable missing
functionality to be tested.
Tests were not failing because there were no expected positive
behavior tests added.
Added changes allow to validate all implemented test cases.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>