Enable MPU to trap NULL access
Enable MPU to trap NULL access

Change-Id: I9c4e10a5ffbd4f83689d0ed874bf1a95934fd56a
Reviewed-on: https://robertou.com/gerrit/500
Tested-by: Jenkins CI
Reviewed-by: Kyle Zentner <f75b86e3af539008d20a21b76724217a6a08bb10@pioneers.berkeley.edu>

chuen0630/tenshi,chuen0630/tenshi,SamboyKirk/tenshi,zentner-kyle/tenshi-old,jarzofjam/tenshi,hozhu123/tenshi,cduck/tenshi,jessicakam/tenshi,pioneers/tenshi,jessicakam/tenshi,chuen0630/tenshi,jarzofjam/tenshi,jessicakam/tenshi,tobinsarah/tenshi,jarzofjam/tenshi,abhishyantkhare/tenshi,SamboyKirk/tenshi,hozhu123/tenshi,SamboyKirk/tenshi,pioneers/tenshi,tobinsarah/tenshi,JaronArmiger/tenshi,jessicakam/tenshi,tobinsarah/tenshi,chuen0630/tenshi,abhishyantkhare/tenshi,jessicakam/tenshi,zentner-kyle/tenshi-old,tobinsarah/tenshi,pioneers/tenshi,hozhu123/tenshi,SamboyKirk/tenshi,jarzofjam/tenshi,zentner-kyle/tenshi-old,cduck/tenshi,pioneers/tenshi,pioneers/tenshi,abhishyantkhare/tenshi,cduck/tenshi,abhishyantkhare/tenshi,jessicakam/tenshi,tobinsarah/tenshi,hozhu123/tenshi,hozhu123/tenshi,JaronArmiger/tenshi,jarzofjam/tenshi,SamboyKirk/tenshi,chuen0630/tenshi,cduck/tenshi,JaronArmiger/tenshi,hozhu123/tenshi,tobinsarah/tenshi,cduck/tenshi,JaronArmiger/tenshi,abhishyantkhare/tenshi,cduck/tenshi,zentner-kyle/tenshi-old,JaronArmiger/tenshi,SamboyKirk/tenshi,cduck/tenshi,hozhu123/tenshi,jarzofjam/tenshi,SamboyKirk/tenshi,pioneers/tenshi,zentner-kyle/tenshi-old,chuen0630/tenshi,abhishyantkhare/tenshi,JaronArmiger/tenshi,pioneers/tenshi,abhishyantkhare/tenshi,tobinsarah/tenshi,chuen0630/tenshi,jessicakam/tenshi,JaronArmiger/tenshi,zentner-kyle/tenshi-old,jarzofjam/tenshi