message: Improve 216^3 C2R and R2C case on MI100/MI50.
diff: @@ -518,8 +518,8 @@ def list_large_kernels():
  'sp': 'false', 'dp': 'false'}),
  NS(length=208, factors=[13, 16], use_3steps_large_twd={
  'sp': 'false', 'dp': 'false'}),
  - NS(length=216, factors=[8, 3, 3, 3], use_3steps_large_twd={
  - 'sp': 'false', 'dp': 'false'}),
  + NS(length=216, factors=(6, 6, 6), use_3steps_large_twd={
  + 'sp': 'false', 'dp': 'false'}, threads_per_transform= 36),
  NS(length=224, factors=[8, 7, 4], use_3steps_large_twd={
  'sp': 'true', 'dp': 'false'}),
  NS(length=240, factors=[8, 5, 6], use_3steps_large_twd={
  