Add audio permission check to audio product strategies

Also moved legacy audio stream conversion methods outside of the
permission check since they are used in various non-permission
guarded use cases (i.e. audio attribute legacy stream conversions)

Bug: 316643994
Test: atest AudioManagerTest
Flag: android.media.audiopolicy.multi_zone_audio
Change-Id: I542545ee174e6712d56bf8ab820a7676dcb37be5