DO NOT MERGE: Revert "Revert "Add libprocessgroup dependency and fix sched_policy include""

This reverts commit 7194e6da8a37a0e222b2f81e2d55a8013e657a13.

Reason for revert: AOSP is fixed with new vendor image

Change-Id: I15797a30abcc304379db05bec1b25a0bd95b2ff4
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
diff --git a/media/libaudioclient/AudioTrack.cpp b/media/libaudioclient/AudioTrack.cpp
index adeb6a6..b728897 100644
--- a/media/libaudioclient/AudioTrack.cpp
+++ b/media/libaudioclient/AudioTrack.cpp
@@ -29,6 +29,7 @@
 #include <media/AudioTrack.h>
 #include <utils/Log.h>
 #include <private/media/AudioTrackShared.h>
+#include <processgroup/sched_policy.h>
 #include <media/IAudioFlinger.h>
 #include <media/AudioParameter.h>
 #include <media/AudioPolicyHelper.h>