Currently methods to create netlink message in RtNetlinkLinkMessage
take interface name, while interface index is a more deterministic way
to define an interface.
This patch changes these methods from taking interface name to taking
interface index.
Bug: 404378068
Test: NetworkStaticLibTests
Flag: EXEMPT mainline
Change-Id: I0754ee53eb0160e67f24e36340abf91b1e87d0e7