Remove beginOp and IOperation

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

Bug: 152536287
Test: VtsHalKeymasterV4_1TargetTest
Change-Id: Iea731d3986c933a1ea43603c60af21aa57ae8bcb
1 file changed