Fix gpuservice_unittest mem leaks

- Activated thread pool to handle statsd binder transactions

Bug: 222527290
Test: atest gpuservice_unittest
Change-Id: If9235e20b9ef818891cd784b3361c31b94fb5b56
diff --git a/services/gpuservice/tests/unittests/Android.bp b/services/gpuservice/tests/unittests/Android.bp
index 4fb0d2e..86f6c7f 100644
--- a/services/gpuservice/tests/unittests/Android.bp
+++ b/services/gpuservice/tests/unittests/Android.bp
@@ -35,6 +35,7 @@
     header_libs: ["bpf_headers"],
     shared_libs: [
         "libbase",
+        "libbinder",
         "libbpf_bcc",
         "libcutils",
         "libgfxstats",