AudioRecord: fix obtainBuffer restore sequence

A counter mismatch can prevent the restoreRecord_l() from being
called.

Test: atest AudioRecordTest
Test: launch camera app and start record
Test: for run in {1..10}; do (sleep 8; echo $run; adb shell pkill audioserver); done
Flag: EXEMPT bugfix
Bug: 374318264
Merged-In: I9693dfbf471bd8e041b477e8916db48922c48c57
Change-Id: I9693dfbf471bd8e041b477e8916db48922c48c57