linuxptp: Update to 4.0

linuxptp: Update to 4.0

Major changes since version 3.1.1:
* Officially supports the 2019 version of IEEE 1588
* Improved unicast messaging
* Enhanced G.8275.2 profile
* More flexible Pulse Per Second (PPS) handling
* Virtual clock support
* Power profile support
* VLAN over bond support.
* Parallel Redundancy Protocol (PRP) trailer handling.
* Non-privileged read-only monitoring port.
* New statistics reporting.

[V2]
 * reset package release
 * adapt license name to the new format

Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@westermo.com>