Revert "audio policy: fix preferred input device use in getInput..."

Revert submission 31539765-cherrypicker-L70300030009242895:N43100030156877762

Reason for revert: <Potential culprit for b/394241864    - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted>

Reverted changes: /q/submissionid:31539765-cherrypicker-L70300030009242895:N43100030156877762

Change-Id: I7490f94c4fbeb2edbdec159091d0ce9a78f2e7b1