i965/gen6: Move setup of CC state batches to emit time.

i965/gen6: Move setup of CC state batches to emit time.

This is part of a series trying to eliminate the separate prepare()
hook in state upload.  The prepare() hook existed to support the
check_aperture in between calculating state updates and setting up the
batch, but there should be no reason for that any more.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Paul Berry <stereotype441@gmail.com>