i965: Re-emit depth/stencil/hiz on BRW_NEW_AUX_STATE

i965: Re-emit depth/stencil/hiz on BRW_NEW_AUX_STATE

Certain things can change the aux usage or fast clear color of a depth
surface and we want to re-emit if that happens.  For instance, if you do
a fast depth clear of an already clear depth surface, we will just set
the clear color and not do anything else.  In that case, we could fail
to re-emit 3DSTATE_CLEAR_PARAMS and not get the new fast-clear color.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>