ipc4: mixin: Add "mix with gain" HiFi5 impl#9795

kv2019i merged 5 commits intothesofproject:mainthesofproject/sof:mainfrom

serhiy-katsyuba-intel:mix_with_gain_HiFi5serhiy-katsyuba-intel/sof:mix_with_gain_HiFi5Copy head branch name to clipboard