P20 mux: further improvements #24497

Job	Run time
LP64-WIP	4m 27s
build-windows (mnfst, imx8m imx8ulp)	10m 7s
build-linux (mnfst, lnl)	5m 16s
build-linux (mnfst, ptl)	6m 35s
build-linux (mnfst, mtl)	5m 29s
build-windows (-d, mnfst, lnl)	8m 41s
build-linux (mnfst, imx8 imx8x)	5m 41s
build-windows (mnfst, imx8 imx8x)	9m 11s
build-linux (mnfst, wcl imx95)	7m 18s
manifest-check	3m 27s
build-windows (mnfst, tgl-h)	8m 3s
build-linux (mnfst, imx8m imx8ulp)	5m 54s
build-linux (-d, mnfst, lnl)	5m 20s
build-windows (mnfst, mtl)	9m 38s
build-windows (mnfst, tgl)	12m 1s
build-windows (mnfst, lnl)	8m 6s
build-linux (mnfst, tgl-h)	4m 43s
build-windows (mnfst, ptl)	9m 12s
build-linux (mnfst, tgl)	4m 47s
compare-linux-win	27s
	2h 14m 23s

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