[RN] Fix a strange import of a feature by itself

react/features/base/participants/components/Avatar.native.js

 import React, { Component } from 'react';
 import { View } from 'react-native';
-import { CachedImage, ImageCache } from 'react-native-img-cache';
 
+import { CachedImage, ImageCache } from '../../../mobile/image-cache';
 import { Platform } from '../../react';
 import { ColorPalette } from '../../styles';
 

react/features/mobile/image-cache/functions.js

-import { ImageCache } from 'react-native-img-cache';
+import { ImageCache } from './';
 
 /**
  * Notifies about the successful download of an <tt>Image</tt> source. The name

react/features/mobile/image-cache/index.js

 export * from './functions';
+export * from './react-native-img-cache';
 
 import './middleware';

react/features/mobile/image-cache/middleware.js

 /* @flow */
 
-import { ImageCache } from 'react-native-img-cache';
-
 import { APP_WILL_MOUNT } from '../../app';
 import { CONFERENCE_FAILED, CONFERENCE_LEFT } from '../../base/conference';
 import {
     PARTICIPANT_UPDATED
 } from '../../base/participants';
 import { MiddlewareRegistry } from '../../base/redux';
-import { prefetch } from '../../mobile/image-cache';
+
+import { ImageCache, prefetch } from './';
 
 /**
  * The indicator which determines whether avatar URLs are to be prefetched in

react/features/mobile/image-cache/react-native-img-cache.android.js

+export * from './react-native-img-cache.yes.js';

react/features/mobile/image-cache/react-native-img-cache.ios.js

+export * from './react-native-img-cache.yes.js';

react/features/mobile/image-cache/react-native-img-cache.yes.js

+export { CachedImage, ImageCache } from 'react-native-img-cache';