Fix "Tracking association..." logspam.

In the previous code, updateTrackingAssociationsLocked() was called too early.
There's still code that changes procstates, so let's move
updateTrackingAssociationsLocked() to the end of updateOomAdjLocked().

Also change Slog.w() to Slog.wtf() so we can monitor it on APR.

Also rate limit the WTF to at most one in ten seconds.

Bug: 118826162
Test: Boot with and without the fix and make sure the number of the warnings
reduces.
(We still have a couple WTFs from during a boot with this CL, which requires
further investigation.)

Change-Id: Ifa1fe85de82fa1d1d8f843372c54c1248966a62a