Bluetooh: host: Add CTE RX and sample enable for conn mode

Add enable of CTE reception and sampling in connected mode.

The implementation allows an application to decide what type
of CTE is expected to be reported. Bluetooth Core specification
does not provide such functionality, so it is provided as part
of host implementation. Host will filter out all reports for not
enabled CTE types.

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