SoundTrigger: Remove unused include.

Test: compiles
Change-Id: I2537c09c31096ea39a130a37f9ea7979fe473c3c
diff --git a/services/soundtrigger/SoundTriggerHalHidl.cpp b/services/soundtrigger/SoundTriggerHalHidl.cpp
index ce39599..6298adc 100644
--- a/services/soundtrigger/SoundTriggerHalHidl.cpp
+++ b/services/soundtrigger/SoundTriggerHalHidl.cpp
@@ -19,7 +19,6 @@
 
 #include <utils/Log.h>
 #include "SoundTriggerHalHidl.h"
-#include <hidl/ServiceManagement.h>
 #include <hwbinder/IPCThreadState.h>
 #include <hwbinder/ProcessState.h>