Remove unused include of hidl/ServiceManagement.h.

Test: compiles
Change-Id: Ia8686e8455be2bbf02768362b7553c726f0c181f
diff --git a/benchmarks/msgq_benchmark_service.cpp b/benchmarks/msgq_benchmark_service.cpp
index 8f57592..6548124 100644
--- a/benchmarks/msgq_benchmark_service.cpp
+++ b/benchmarks/msgq_benchmark_service.cpp
@@ -14,7 +14,6 @@
 * limitations under the License.
 */
 
-#include <hidl/ServiceManagement.h>
 #include <hidl/HidlTransportSupport.h>
 #include <utils/Looper.h>
 #include <utils/StrongPointer.h>