Remove some test-only methods from base MTRDeviceController.

These are only used with concrete controllers from tests, and are already
implemented by MTRDeviceController_Concrete.

src/darwin/Framework/CHIP/MTRDeviceController.mm

@@ -449,18 +449,6 @@ - (void)removeDevice:(MTRDevice *)device
     }
 }
 
-#ifdef DEBUG
-- (NSDictionary<NSNumber *, NSNumber *> *)unitTestGetDeviceAttributeCounts
-{
-    std::lock_guard lock(*self.deviceMapLock);
-    NSMutableDictionary<NSNumber *, NSNumber *> * deviceAttributeCounts = [NSMutableDictionary dictionary];
-    for (NSNumber * nodeID in _nodeIDToDeviceMap) {
-        deviceAttributeCounts[nodeID] = @([[_nodeIDToDeviceMap objectForKey:nodeID] unitTestAttributeCount]);
-    }
-    return deviceAttributeCounts;
-}
-#endif
-
 - (BOOL)setOperationalCertificateIssuer:(nullable id<MTROperationalCertificateIssuer>)operationalCertificateIssuer
                                   queue:(nullable dispatch_queue_t)queue
 {
@@ -728,15 +716,6 @@ - (nullable NSNumber *)neededReadPrivilegeForClusterID:(NSNumber *)clusterID att
     return nil;
 }
 
-#ifdef DEBUG
-+ (void)forceLocalhostAdvertisingOnly
-{
-    auto interfaceIndex = chip::Inet::InterfaceId::PlatformType(kDNSServiceInterfaceIndexLocalOnly);
-    auto interfaceId = chip::Inet::InterfaceId(interfaceIndex);
-    chip::app::DnssdServer::Instance().SetInterfaceId(interfaceId);
-}
-#endif // DEBUG
-
 #pragma mark - MTRDeviceControllerDelegate management
 
 // Note these are implemented in the base class so that XPC subclass can use it as well