hidl_test: Fix failing tests.

Test: The following succeeds.
croot && cd hardware/interfaces
mma
croot && cd system/tools/hidl
mma
adb shell /data/nativetest64/hidl_test/hidl_test

Bug: 31819198

Change-Id: I40c2338d09d5e80b9bad2d918b7b8c3f2709f434
diff --git a/tests/foo/1.0/default/FooCallback.h b/tests/foo/1.0/default/FooCallback.h
index 6c284ca..5921972 100644
--- a/tests/foo/1.0/default/FooCallback.h
+++ b/tests/foo/1.0/default/FooCallback.h
@@ -22,7 +22,7 @@
 using ::android::sp;
 
 struct FooCallback : public IFooCallback {
-    FooCallback() : mLock{}, mCond{} {}
+    FooCallback();
     // Methods from ::android::hardware::tests::foo::V1_0::IFooCallback follow.
     Return<void> heyItsYou(const sp<IFooCallback>& cb)  override;
     Return<bool> heyItsYouIsntIt(const sp<IFooCallback>& cb)  override;