remove preferences controller from mmi controller

Author: kanthesha

app/scripts/metamask-controller.js

@@ -2028,7 +2028,6 @@ export default class MetamaskController extends EventEmitter {
       messagingSystem: mmiControllerMessenger,
       mmiConfigurationController: this.mmiConfigurationController,
       keyringController: this.keyringController,
-      preferencesController: this.preferencesController,
       appStateController: this.appStateController,
       transactionUpdateController: this.transactionUpdateController,
       custodyController: this.custodyController,