move trans->assignment_done to cc.assignment_started

The flag is set to true when an assignment has been started, and it is only
relevant for a CC transaction. So fix naming and place in cc struct.

Cosmetic preparation for I1f8746e7babfcd3028a4d2c0ba260c608c686c76 and
I0ba216b737909e92080a722db26e3577726c63cb/

Change-Id: I8dacf46141ba0b664e85b0867ade330c97d8495f
2 files changed