Use IPV6_MIN_MTU from NetworkConstants in Ikev2Vpn

Instead of sharing the constant from LinkProperties, use the already
defined constant in the NetworkConstants class.

This allows Ikev2VpnProfile to allow depending on non-public
LinkProperties APIs, as LinkProperties is planned to move to
framework-connectivity.

Bug: 174436414
Test: m
Change-Id: I594bb7e81bc7681799c16eff621a5ffd1b29624c
1 file changed
tree: 1c45237414b30ac76f8a5083a2f876a30d15d8bd
  1. core/
  2. services/
  3. tests/