DRC: math: Replace exponential function for performance #343

Job	Run time
LP64-WIP	3m 32s
build-windows (imx8 imx8x imx8m)	4m 48s
build-linux (mnfst, imx8 imx8x imx8m)	4m 33s
build-windows (mtl)	4m 50s
build-linux (mnfst, mtl)	4m 27s
manifest-check	56s
build-windows (tgl tgl-h)	4m 49s
build-linux (mnfst, lnl)	3m 57s
build-windows (-d, mtl)	4m 38s
build-linux (mnfst, tgl tgl-h)	4m 53s
build-linux (zmain, imx8 imx8x imx8m)	4m 22s
build-linux (zmain, mtl)	3m 59s
build-linux (zmain, lnl)	3m 52s
build-linux (zmain, tgl tgl-h)	4m 46s
build-linux (-d, mnfst, mtl)	4m 14s
compare-linux-win	35s
	1h 3m 11s

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