Delete the legacy experiment flag IPCLIENT_PARSE_NETLINK_EVENTS_VERSION

Given we enable the feature of parsing netlink events in user space by
default with a kill switch flag, then cleanup the legacy experiment flag
IPCLIENT_PARSE_NETLINK_EVENTS_VERSION.

Bug: 163492391
Test: atest NetworkStackTests
Change-Id: I661d0981ada3032f9723bd4f348e4ee10631176c
2 files changed