Effect AIDL: remove placeholder effect from default implementation

Bug: 328330990
Test: atest --test-mapping hardware/interfaces/audio/aidl/vts:presubmit
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:f84adb0fade1dbbf5b56a3cd06e0bb27a9fc6945)
Merged-In: Icf15e349a2ad36eeefa1e3eb46428c04ae164ad1
Change-Id: Icf15e349a2ad36eeefa1e3eb46428c04ae164ad1
1 file changed