change device plugin support check

Summary: Invert the way device plugin <-> device support works with the long term goal of supporting user defined device plugins

Reviewed By: danielbuechele

Differential Revision: D10240765

fbshipit-source-id: 9e886518a2fbfd263c79daa4b805c088ab38ab87

src/devices/IOSDevice.js

@@ -31,7 +31,6 @@ type RawLogEntry = {|
 |};
 
 export default class IOSDevice extends BaseDevice {
-  supportedPlugins = ['DeviceLogs'];
   icon = 'icons/ios.svg';
   os = 'iOS';