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radv: Support SDMA in some helper functions

Timur Kristóf requested to merge Venemo/mesa:radv_preliminary_transfer_queue_sdma_helpers into main

Preliminary work for enabling transfer queues in RADV.

Based on !25770 (merged) and !25850 (merged)

This MR adds support for the SDMA in these 3 functions:

  • radv_cs_write_data_head - enables transfer queues to write eg. image metadata
  • radv_cp_wait_mem and si_cs_emit_write_event_eop - enable transfer queues to work with gang semaphores, including those used by the gang wait pre and postambles
Edited by Timur Kristóf

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