anv: only emit CFE_STATE when scratch space increases

anv: only emit CFE_STATE when scratch space increases

On Gen12.5+, we only need to emit CFE_STATE when scratch space
has changed, not on every pipeline binding. Also, only grow the
scratch space, never shrink it. Need to reset after secondary buf.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22179>