Implement Deref / DerefMut traits of mm_stage1_locked.
Implement Deref / DerefMut traits of mm_stage1_locked.

project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification,project-oak/hafnium-verification