Bluetooth: controller: lll: add TX configuration of CTE in conn mode

Add configuration of transmission of CTE in connected mode.
The transmission is enabled only for PDUs that have CTE present (CP)
bit set to 1.
Radio peripheral is configued by df_cte_tx_configure to transmit CTE.
The same parameters are set for connected and connectionless mode.
The function was changed to re-use the same code for configuration
of CTE in both modes.

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