[ReactNative] resizeMode is not a nativeOnly prop

Summary:
resizeMode is a native prop, but it is also in the propTypes, so this causes an incorrect warning:

```
Prop resizeMode = `contain` should not be set directly on Image.
```

@public

Test Plan: No warnings on image example in UIExplorer

Libraries/Image/Image.ios.js

@@ -178,7 +178,6 @@ var nativeOnlyProps = {
   src: true,
   defaultImageSrc: true,
   imageTag: true,
-  resizeMode: true,
 };
 if (__DEV__) {
   verifyPropTypes(Image, RCTStaticImage.viewConfig, nativeOnlyProps);