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macsec: fix tracking of parent ifindex

Beniamino Galvani requested to merge bg/macsec-parent into main

For MACsec interfaces, kernel announces the parent ifindex in the generic IFLA_LINK netlink attribute, which we save in NMPlatformLink.parent. There is no need to have a dedicate member in NMPlatformLnkMacsec.

The dedicate member was never set and during a restart of NetworkManager the parent of the MACsec device could be unset leading to a failed assertion:

  act_stage2_config: assertion 'parent' failed

Fixes: 85103656 ('platform: add support for macsec links')

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