[FEATURE] spresense add ostest, coremark, getprime configs.

[cederom]

Is your feature request related to a problem? Please describe.

For testing purposes it would be nice to have dedicated ostest, coremark, getprime configs for spresense board.

Describe the solution you'd like

Add ostest, coremark, getprime configs to spresense board.

Describe alternatives you've considered

No response

Verification

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