Making adjustSuggestestedStreamVolumes consistent

Shifting MediaMetrics and external volume controller check so both
implementations of adjustSuggestedStreamVolume perform both actions

Fixes: 157665889
Test: Ran target with external volume controller and verified it was
triggered when adjusting volume

Change-Id: I9d1bcb9a84f495bdb8c7575fcd80abab4bbd0763
1 file changed