[microNPU][ETHOSU] Fix SoftMax legalization parameters

[Aleksei-grovety]

Fix SoftMax legalization parameters according to the values in Vela.

cc @neildhickey, @lhutton1, @ekalda, @leandron

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• cc @Mousius, @leandron _{See #10317 for details}

_{Generated by tvm-bot}

[ekalda]

Thanks for the PR @Aleksei-grovety! I'm wondering if there could be a test included that exercises this change?

[Aleksei-grovety]

I checked the output of the generated commands in TVM and Vela and updated legalization test accordingly.

[lhutton1]

@tvm-bot rerun

[lhutton1]

Thanks @Aleksei-grovety @ekalda!