Xcode Missing Support Files iOS 12.2 (16E227)

Download device support files from here -https://github.com/iGhibli/iOS-DeviceSupport/blob/master/DeviceSupport/12.2%20(16E226).zip, if your Xcode version doesn't have them. Extract the zip file and copy to /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport. Rename 16E266 folder to 16E227. Restart XCode.

As pointed out by @DavidH, this worked for me.

After copying and renaming the folder, if problem persists, restart the Mac.