Fix low quality CTS failures

buildTvInteractiveAppServiceListLocked() and
buildTvAdServiceListLocked() are called in onBootPhase() in
order. The first function sets iAppMap and the second one clears it.
The test cannot see the services because they are cleared by the call to
buildTvAdServiceListLocked().

Bug: b/326220449 (all other tests in the module have the same issue)

Test: atest
"CtsTvTestCases:android.media.tv.interactive.cts.TvInteractiveAppServiceTest#testRequestSelectedTrackInfo"
--iterations 100

Change-Id: Ia9d341b2ad8bc0eecb3d012645412528aa81d39a