[llvm] [AMDGPU] Fix LDS bank count for gfx704 and gfx950 (PR #220632)

[Chinmay Deshpande via llvm-commits]

================
@@ -1870,11 +1870,11 @@ def FeatureISAVersion7_0_3 : FeatureSet<
 
 def FeatureISAVersion7_0_4 : FeatureSet<
   [FeatureSeaIslands,
-   FeatureLDSBankCount32]>;
+   FeatureLDSBankCount16]>;
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chinmaydd wrote:

```suggestion
   FeatureLDSBankCount32]>;
```

https://github.com/llvm/llvm-project/pull/220632