Remove IOperation and beginOp.

The way I planned for this to work doesn't work.  We'll revisit in
Keymaster5.  For now, removing IOperation and beginOp.

Test: Build & boot
Merged-In: I017d17079380cc3bacc6f05b2486e1b6e6c3f675
Change-Id: I017d17079380cc3bacc6f05b2486e1b6e6c3f675
7 files changed