tests:math:p_pow: Restore gold data to good values
tests:math:p_pow: Restore gold data to good values

We should never change the golden data unless it is wrong.

Partial revert of:
Implement fastest pow() function base on the work of Harrison Ainsworth
f80c1c55c6278d219c024d95d4965fc3227aeb2b

Signed-off-by: Ola Jeppsson <793f970c52ded1276b9264c742f19d1888cbaf73@adapteva.com>

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