make update-api

This CL almost exactly reverts http://r.android.com/471377 .

current.txt and friends were not reflecting the latest AOSP API,
ie. "make update-api" was not a no-op like it's supposed to be.

Apart from IpSecManager.SecurityParameterIndex.finalize(), this
seems to mostly revert http://r.android.com/471377 which suggests
that the tooling change that necessitated that CL was probably
reverted without "make update-api" being run on AOSP.

No further investigation was made for what CL(s) caused this or
whether any of this API change is undesired.

Test: Treehugger
Test: make update-api

Change-Id: I5b846627e38c47abb534def97f0cab9d28b1288c