Bluetooth: Controller: radio: Fix error in pkt conf macros

Macros responsible for preparation of packet configuration flags in
regard of PHY and CTE were wrong. PHY flags are not used as regular
integer values but bits in a bitfield, hence size of the field in
packet configuration flags is three instead of two.
In such case CTE presen filed should be moved to bit 4th.

The problem was spot when testing implementation with CODED PHY
enabled. When device was sending PDUs that had attached CTE the
radio was configured to use CODED PHY due to wrong bit set in
packet configuration flags variable (overlapping of CTE bit
with CODED PHY bit).

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