Improve dumpsys for capture threads

Show per-track sample rate, and whether there is a fast capture thread

Change-Id: If6a08a40d1eeba0690aa8da3c541f845ec101b7f
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 0f01b02..e17aa98 100755
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -4783,7 +4783,7 @@
     , mPipeFramesP2(0)
     // mPipeMemory
     // mFastCaptureNBLogWriter
-    , mFastTrackAvail(true)
+    , mFastTrackAvail(false)
 {
     snprintf(mName, kNameLength, "AudioIn_%X", id);
     mNBLogWriter = audioFlinger->newWriter_l(kLogSize, mName);
@@ -4895,6 +4895,7 @@
         // FIXME
 #endif
 
+        mFastTrackAvail = true;
     }
 failed: ;
 
@@ -5745,6 +5746,7 @@
     } else {
         dprintf(fd, "  No active record clients\n");
     }
+    dprintf(fd, "  Fast capture thread: %s\n", hasFastCapture() ? "yes" : "no");
     dprintf(fd, "  Fast track available: %s\n", mFastTrackAvail ? "yes" : "no");
 
     dumpBase(fd, args);