Change log tag used in IpClientLinkObserver.

"NetlinkTracker" is still used in IpClientLinkObserver class as tag,
which is legacy tag and NetlinkTracker class in f/b also uses it for
logging, to better differentiate the netlink events log in dumpsys,
use a different log tag in IpClientLinkObserver.

Bug: 163492391
Test: m
Change-Id: Ieed4a45b2bcc3933e491f3afebc055b469c4da64
2 files changed