Two protos: one for data, one for errors.

Also added version number to proto, to ensure compatibility.

Bug: 116373678

Test: manual on walleye
Test: tapas device_info_app && make
Test: adb install out/target/product/generic/system/app/device_info_app/device_info_app.apk
Test: Run installed APK and 'press button'
Change-Id: Iaf4a89a7234f8ba1b859a8b87844ff6e9f6d7e14
5 files changed