tu: Don't WFI after initializing RB_CCU_CNTL on a7xx

There's no reason to do this and the blob doesn't.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30544>

src/freedreno/vulkan/tu_cmd_buffer.cc

@@ -1300,7 +1300,6 @@ tu6_init_hw(struct tu_cmd_buffer *cmd, struct tu_cs *cs)
             !dev->physical_device->info->a6xx.has_gmem_fast_clear,
          .concurrent_resolve = dev->physical_device->info->a6xx.concurrent_resolve,
       ));
-      tu_cs_emit_wfi(cs);
    }
 
    emit_rb_ccu_cntl<CHIP>(cs, cmd->device, false);