Fix OTA on unified builds for real

  * I hate this app :D

Change-Id: Ia131af59da6bf3666a3ae7b72fc3a916b1b4a326
Signed-off-by: Josue Rivera <prbassplayer@gmail.com>
Use ro.slim.model

Change-Id: I4b51f373fac9eb838be393009c81836cc93c7dce