[BR03.3] Add feature version constant for accessing bpf in Connectivity

This is needed by the callers to determine if the Tethering
module is new enough to support the API that get whether
the network is blocked for the given uid and conditions.

Test: adb shell cmd network_stack is-uid-networking-blocked <uid> <metered>
Bug: 297836825
Change-Id: Ie79eacb1e63ff60291ad4f0ef6e8bba5ab0bdb07