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An extra control register word, tpu_tag_cdm_ctrl, will be present when TPU_DM_GLOBAL_REGISTERS feature is present. Emit it when it's needed. The document of this register is available, however I don't think any of the bits are needed to be set for our current feature set, so just emit 0 now. Signed-off-by: Icenowy Zheng <uwu@icenowy.me> Reviewed-by: Frank Binns <frank.binns@imgtec.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30552>