unix: add PTP IOCTLs on Linux

[yarikk]

The IOCTLs are used for interacting with PTP-specific functions of NIC and time card drivers.

Description:
https://netdevconf.info/0x18/docs/netdev-0x18-paper39-talk-slides/netdev-intro-ptp-api.pdf

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This PR is being closed because golang.org/cl/621375 has been merged.