Bluetooth: controller: llcp: initialise DLE parameters

The initialisation of DLE parameters for the peripheral
was done before the intialisation of the PHY settings.
Since the DLE parameters depend on PHY settings this
can result in incorrect parameters for tx/rx time and
octets
One scenario is where a previous connection set the PHY to
2M or CODED, then when a new connection is established
it uses the same memory-locations for connection settings as the
previous connection, and the (uninitialised) PHY settings will be
set to 2M or CODED, and thus the DLE parameters will be wrong
This PR moves the initialisation of DLE parameters after
that of PHY settings

EBQ tests effected include LL/CON/PER/BV-77-C.

Signed-off-by: Andries Kruithof <andries.kruithof@nordicsemi.no>