Fix initialization of AAC presentation struct

Otherwise the new size checks trip on this.

Bug: 27207275
Change-Id: I1f8f01097e3a88ff041b69279a6121be842f1766

void ACodec::onFrameRendered(int64_t mediaTimeUs, nsecs_t systemNano) {
 if (mRenderTracker.onFrameRendered(mediaTimeUs, systemNano) != OK) {
        mRenderTracker.dumpRenderQueue();
 }
}

void ACodec::onFrameRendered(int64_t mediaTimeUs, nsecs_t systemNano) {
 if (mRenderTracker.onFrameRendered(mediaTimeUs, systemNano) != OK) {
        mRenderTracker.dumpRenderQueue();
 }
}
