Bluetooth: controller: add struct for conf of CTE rx in conn mode

Add new strcture type for storage of CTE receive parameters.
The structure will be used in to store parameters for connected mode.

The parameters provided by HCI commands for receiving CTE
in connected mode and disconnected mode are a bit different.
There is common subset of parameters but extraction of those
into common structure would increase of size of other stuctures
that aggregate them.

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