[Darwin] New XPC bits need to initialize properly

src/darwin/Framework/CHIP/MTRDevice.mm

@@ -491,6 +491,8 @@ - (instancetype)initForSubclassesWithNodeID:(NSNumber *)nodeID controller:(MTRDe
     if (self = [super init]) {
         _lock = OS_UNFAIR_LOCK_INIT;
         _delegates = [NSMutableSet set];
+        _deviceController = controller;
+        _nodeID = nodeID;
     }
 
     return self;

src/darwin/Framework/CHIP/MTRDeviceController.mm

@@ -109,9 +109,6 @@
 using namespace chip::Tracing::DarwinFramework;
 
 @implementation MTRDeviceController {
-    // queue used to serialize all work performed by the MTRDeviceController
-    dispatch_queue_t _chipWorkQueue;
-
     chip::Controller::DeviceCommissioner * _cppCommissioner;
     chip::Credentials::PartialDACVerifier * _partialDACVerifier;
     chip::Credentials::DefaultDACVerifier * _defaultDACVerifier;

src/darwin/Framework/CHIP/MTRDeviceController_Internal.h

@@ -68,6 +68,10 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, readwrite, nullable) NSMapTable * nodeIDToDeviceMap;
 @property (readonly, assign) os_unfair_lock_t deviceMapLock;
 
+// queue used to serialize all work performed by the MTRDeviceController
+// (moved here so subclasses can initialize differently)
+@property (readwrite, retain) dispatch_queue_t chipWorkQueue;
+
 - (instancetype)initForSubclasses;
 
 #pragma mark - MTRDeviceControllerFactory methods

src/darwin/Framework/CHIP/MTRDeviceController_XPC.mm

@@ -79,6 +79,8 @@ - (id)initWithUniqueIdentifier:(NSUUID *)UUID xpConnectionBlock:(NSXPCConnection
 
         self.xpcConnection = connectionBlock();
         self.uniqueIdentifier = UUID;
+        self.chipWorkQueue = dispatch_queue_create("MTRDeviceController_XPC_queue", DISPATCH_QUEUE_SERIAL_WITH_AUTORELEASE_POOL);
+        self.nodeIDToDeviceMap = [NSMapTable strongToWeakObjectsMapTable];
 
         MTR_LOG("Set up XPC Connection: %@", self.xpcConnection);
         if (self.xpcConnection) {