[mlir][tosa] Add ext-mxfp support for const and cast ops (#163641) This commit allows const and cast ops with MXFP datatypes through the validation pass when specification version 1.1.draft is selected. Note: it doesn't include support for the mxint8 datatype. This will be added in a separate commit. Note: this commit adds support as defined in the spec in https://github.com/arm/tosa-specification/commit/063846a75b9687ab01e58cb3538472bffb3a03b0. EXT_MXFP extension is considered experimental and subject to breaking change.
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