drm/amdkfd: Add chained_runlist_idle_disable flag to pm4_mes_runlist

New flag to disable an idle runlist optimization that is causing soft
hangs with some diffult-to-reproduce customer workloads. This will
serve as a workaround until the problem can be reproduced and the
root-cause determined.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oak Zeng <Oak.Zeng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_pm4_headers_ai.h

@@ -120,7 +120,7 @@ struct pm4_mes_runlist {
 			uint32_t ib_size:20;
 			uint32_t chain:1;
 			uint32_t offload_polling:1;
-			uint32_t reserved2:1;
+			uint32_t chained_runlist_idle_disable:1;
 			uint32_t valid:1;
 			uint32_t process_cnt:4;
 			uint32_t reserved3:4;