DRC: math: Replace exponential function for performance #345

Job	Run time
LP64-WIP	3m 20s
build-linux (mnfst, imx8 imx8x imx8m)	4m 5s
build-windows (imx8 imx8x imx8m)	6m 43s
build-linux (mnfst, mtl)	4m 24s
build-windows (mtl)	5m 26s
build-linux (mnfst, lnl)	3m 55s
manifest-check	53s
build-linux (mnfst, tgl tgl-h)	5m 25s
build-windows (tgl tgl-h)	7m 21s
build-linux (zmain, imx8 imx8x imx8m)	4m 8s
build-windows (-d, mtl)	5m 30s
build-linux (zmain, mtl)	4m 12s
build-linux (zmain, lnl)	4m 7s
build-linux (zmain, tgl tgl-h)	5m 8s
build-linux (-d, mnfst, mtl)	4m 11s
compare-linux-win	1m 16s
	1h 10m 4s

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