Expose add/removeAddress for IpSecInterfaces

When exposing the APIs, these were missed.
The outer structure is exposed, so this exposes
the addAddress and removeAddress methods.

Bug: 75234273
Test: compilation
Merged-In: I79911434f9baa660e4d8564cc59d80da4a710c42
Change-Id: I79911434f9baa660e4d8564cc59d80da4a710c42
(cherry picked from commit a83601a5)