freedreno/ir3: Switch to NIR for a5xx's vertex id lowering.

freedreno/ir3: Switch to NIR for a5xx's vertex id lowering.

This was similarly done for a3xx & a4xx with 4bdd226ab61
("freedreno/ir3: Switch to NIR for a3xx/a4xx's vertex id lowering.")
already, yet a5xx was missed which I noticed as Minecraft window
titlebar text corruption on OnePlus 5T with Adreno 540.

Cc: mesa-stable
Signed-off-by: Jami Kettunen <jami.kettunen@protonmail.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19263>