Make VpnProfile.maxMtu default value match Ikev2VpnProfile

This change corrects the VpnProfile's maxMtu defaults to match that of
the Ikev2VpnProfile. 1400 is too high as a default, and Settings will
run into an issue here quite often.

Bug: 152573931
Test: FrameworksNetTests passing
Change-Id: I97ba5903b3cc1ed6a21c706ed3d78bd8ecbeee0c
1 file changed
tree: 45340daf795da3933b49faad6a3a1c0911115b8e
  1. core/
  2. services/
  3. tests/