Set the dispatch queue on system layer earlier in startup. (#21859)

System layer init wants to use the queue.

Fixes #21857

src/platform/Darwin/PlatformManagerImpl.cpp

@@ -55,7 +55,7 @@ CHIP_ERROR PlatformManagerImpl::_InitChipStack()
     mRunLoopSem = dispatch_semaphore_create(0);
 
     // Ensure there is a dispatch queue available
-    GetWorkQueue();
+    static_cast<System::LayerSocketsLoop &>(DeviceLayer::SystemLayer()).SetDispatchQueue(GetWorkQueue());
 
     // Call _InitChipStack() on the generic implementation base class
     // to finish the initialization process.
@@ -70,8 +70,6 @@ CHIP_ERROR PlatformManagerImpl::_InitChipStack()
 
     mStartTime = System::SystemClock().GetMonotonicTimestamp();
 
-    static_cast<System::LayerSocketsLoop &>(DeviceLayer::SystemLayer()).SetDispatchQueue(GetWorkQueue());
-
 exit:
     return err;
 }