Revert "audioflinger: implement silenced capture for mmap"

This reverts commit a2f478ca0b2bda8db9b321f0cfa9e9d3cf6130f9.

Bug: 78118584
Change-Id: Ie0da3dea445f2474c7a889c5f9919305c1c96d40
diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 47fe6ec..ee9ce84 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -1945,7 +1945,7 @@
                   sessionId, uid, false /* isOut */,
                   ALLOC_NONE,
                   TYPE_DEFAULT, portId),
-        mPid(pid), mSilenced(false), mSilencedNotified(false)
+        mPid(pid)
 {
 }