DRC: math: Replace exponential function for performance #339

Job	Run time
LP64-WIP	3m 33s
build-windows (imx8 imx8x imx8m)	6m 6s
build-linux (mnfst, imx8 imx8x imx8m)	4m 11s
build-windows (mtl)	6m 14s
build-linux (mnfst, mtl)	4m 22s
manifest-check	44s
build-windows (tgl tgl-h)	6m 3s
build-linux (mnfst, lnl)	3m 55s
build-windows (-d, mtl)	6m 46s
build-linux (mnfst, tgl tgl-h)	4m 53s
build-linux (zmain, imx8 imx8x imx8m)	4m 1s
build-linux (zmain, mtl)	3m 54s
build-linux (zmain, lnl)	4m 8s
build-linux (zmain, tgl tgl-h)	5m 1s
build-linux (-d, mnfst, mtl)	4m 5s
compare-linux-win	1m 17s
	1h 9m 13s

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