[Codegen] Replace uses of Codegen::DenormalFpMathAttr with the improved DenormalModeKindAttr introduced upstream #23396
Description
After llvm/llvm-project@2502e3b, support for representing fp math types was improved upstream through the addition of the DenormalKindAttr.
Prefer this attribute over the current DenormalFpMathAttr used in Codegen and Hal dialect.