Bluetooth: controller: Do not use LL procedures not supported by remote

Update LLCP handling during PHY update and Data Length update to not
start the LL control procedure if the remote has already indicated that
the procedure is not supported.

This fulfills the following requirement from the BT Core Specification
(Core_v5.2, Vol 6, Part B, Section 4.6):

Except where explicitly stated elsewhere in this specification, if the
peer Link Layer has indicated either during a feature exchange procedure
or by responding with an LL_UNKNOWN_RSP PDU that it does not support a
procedure, then the Link Layer shall not use that procedure.

Re-use the connection parameter request handling for PHY and
data length update procedures.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>