You’re not doing anything wrong. I’m pretty sure google has not yet provided a arm64 version of their libGoogleAnalyticsServices.a, which is really annoying …it has been weeks since the public the release of Xcode 5GM.
For now, I guess only build for armv7, armv7s or remove google analytics until they get their head out of their pants.
UDATE: Finally fixed https://developers.google.com/analytics/devguides/collection/ios/resources