Split wait_offset to version and wait_fd fields

wait_offset (u64) was not used anyway. We need some
kind of signaling that a long running operation
finished on the host side. wait_fd (created by eventfd)
could be used for this purpose.

Bug: 140260110
Test: build
Change-Id: I1c993b19aaa610255f9abec3d87d6865d971585d
Signed-off-by: Roman Kiryanov <rkir@google.com>
2 files changed