Freeze networkstack-aidl-interfaces to version 18

This AIDL freeze includes a new API: updateApfCapabilities to update
Apf capabilities settings when WiFi interface switches from secondary
to primary in STA+STA case.

Bug: 274090839
Test: m
Test: m networkstack-aidl-interfaces-freeze-api
(cherry picked from https://android-review.googlesource.com/q/commit:6a04c1e6bd2425372390bda6c28bfed157d6993c)
Merged-In: Ic0a4dce26d9b7ee08dd9ad44c2e36b1dbbda4bdb
Change-Id: Ic0a4dce26d9b7ee08dd9ad44c2e36b1dbbda4bdb