Effects: set hw volume if effect chain doesn't have volume control

If effect chain has non-offloaded effect, and is enabled for direct
output, when there's no volume control for all the effect modules
within this chain, volume should still be set to HAL.

Test: Play Music, Videos with effects
Bug: 149899134
CRs-Fixed: 2625597
Change-Id: I77bd0d456d5fa4e88afb283002a5eb1e2b704ca8
diff --git a/services/audioflinger/Effects.h b/services/audioflinger/Effects.h
index 4901451..2826297 100644
--- a/services/audioflinger/Effects.h
+++ b/services/audioflinger/Effects.h
@@ -596,6 +596,9 @@
 
     void setThread(const sp<ThreadBase>& thread);
 
+    // true if any effect module within the chain has volume control
+    bool hasVolumeControlEnabled_l() const;
+
     void setVolumeForOutput_l(uint32_t left, uint32_t right);
 
     mutable  Mutex mLock;        // mutex protecting effect list