When Target Device is set to 'iPhone Only' in iOS PlayerSettings, some small icons are missing in Xcode project.

Steps to reproduce:
1) Open the attached project.
2) Build for iOS.
3) Go to ~/XcodeProjectDirectory/Unity-iPhone/Images.xcassets/AppIcon.appiconset/
3) Open Contents.json file.

The Content.json file holds names and properties of all the app icons that should be generated for iPhone, however, some of them are missing from the ~/AppIcon.appiconset folder:
Icon-Small.png
Icon-Small@2x.png
Icon-Small-80.png

This doesn't occur if 'iPad' or 'iPhone & iPad' is selected as Target Device.

Reproduced on:
2017.1.0a3 (3a43d30e7b0d), 5.5.1p3 (versions older than 5.5.1p3 didn't allow these icons due to 815299).