DRC: math: Replace exponential function for performance #333

Job	Run time
build-windows (imx8 imx8x imx8m)	8m 52s
build-linux (mnfst, imx8 imx8x imx8m)	4m 32s
build-windows (mtl)	7m 48s
build-linux (mnfst, mtl)	4m 6s
build-windows (tgl tgl-h)	9m 8s
build-linux (mnfst, lnl)	3m 58s
build-windows (-d, mtl)	8m 8s
build-linux (mnfst, tgl tgl-h)	5m 14s
build-linux (zmain, imx8 imx8x imx8m)	4m 19s
build-linux (zmain, mtl)	3m 59s
LP64-WIP	3m 40s
build-linux (zmain, lnl)	4m 15s
manifest-check	53s
build-linux (zmain, tgl tgl-h)	4m 45s
build-linux (-d, mnfst, mtl)	4m 2s
compare-linux-win	44s
	1h 18m 23s

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