Add display_hw_transfer_time variance to offload cycle stats

Update field order so that they are logged in logical sequence.
The atoms have never been logged in Android or synced to g3, so
this change is considered to be safe.

Bug: 432449540
Test: build
Flag: EXEMPT atom definition
Change-Id: I92e9a628be77154e9943bb0b5fd131d70e3567e5