Cleaned up deviceType enum

Summary:
The device type enum was mixing two different concepts (emulator vs physical) and (archived vs not), and we already have a separate `isArchived` field. So cleaned this up to not leak it into sandy.

If anybody can think of any unforeseen consequences of this, lemme know :)

Reviewed By: jknoxville

Differential Revision: D22763506

fbshipit-source-id: bd2f7dbd1d2d2e6942ba7c6ddd8dc91ee34d591d

desktop/flipper-plugin/src/index.ts

@@ -20,6 +20,7 @@ export {
   DevicePluginClient,
   LogLevel,
   SandyDevicePluginInstance,
+  DeviceType,
 } from './plugin/DevicePlugin';
 export {SandyPluginDefinition} from './plugin/SandyPluginDefinition';
 export {SandyPluginRenderer} from './plugin/PluginRenderer';