Remove template types from lock RAII wrapper usages (#1756)

C++17 has template type autodeduction. These wrappers include
std::lock_guard and std::unique_lock.

hal/src/main/native/athena/DigitalInternal.cpp

@@ -74,7 +74,7 @@ void initializeDigital(int32_t* status) {
   // Initial check, as if it's true initialization has finished
   if (initialized) return;
 
-  std::lock_guard<wpi::mutex> lock(initializeMutex);
+  std::lock_guard lock(initializeMutex);
   // Second check in case another thread was waiting
   if (initialized) return;