Fix Darwin build.

MTRDeviceController_Concrete.h was not including some headers, but this was being covered up until
it started being included from a new translation unit that did not happen to get those headers
from elsewhere.

Author: bzbarsky-apple

src/darwin/Framework/CHIP/MTRDeviceController_Concrete.h

@@ -17,8 +17,7 @@
 
 #import <Foundation/Foundation.h>
 
-#import <Matter/MTRDefines.h>
-#import <Matter/MTRDeviceController.h>
+#import <Matter/Matter.h>
 
 #import "MTRDeviceControllerStartupParams_Internal.h"