freedreno/ir3: add bary_ij as src for meta:tex_prefetch

freedreno/ir3: add bary_ij as src for meta:tex_prefetch

This way RA doesn't have to special case it in use/def accounting..

This gets rid of an extra level of split/collect, which shouldn't be
needed.  And interferes with scheduler trying to put tex-prefetches
after inputs but before other instructions.  (Otherwise it would have
to figure out which split/collects need to go before the tex-prefetch)

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4272>