HiFi optimizations for mean, where, min, max, pow, rem and quantized_linear operators. (#6867)

* Adding mean and where ops optimized on HiFi

* Adding quantized linear optimized versions for int8 and uint8

* adding pow, remainder, minimum, maximum operators (#33)

* adding pow, remainder, minimum, maximum operators

* adding pow, remainder, minimum, maximum operators

* Fix for build issue faced in div_mod on old tools

* Fix build failure due to merge issue

* Fixing review comments on PR 6867

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Co-authored-by: dijopaul <dijopaul@cadence.com>
Co-authored-by: nishpoonia <94543206+nishpoonia@users.noreply.github.com>
Co-authored-by: mcremon-meta <134334895+mcremon-meta@users.noreply.github.com>