west.yml: update zephyr to e4c2cecb7d8 #20379

Job	Run time
LP64-WIP	3m 50s
build-linux (mnfst, mtl lnl)	5m 43s
manifest-check	47s
build-linux (mnfst, ptl)	4m 39s
build-linux (zmain, mtl lnl)	6m 25s
build-linux (mnfst, --all)	1h 4m 19s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 29s
build-linux (zmain, ptl)	53m 57s
build-linux (-d, mnfst, lnl)	4m 40s
build-linux (zmain, tgl tgl-h)	5m 27s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 45s
build-windows (tgl tgl-h)	6m 54s
build-linux (mnfst, tgl tgl-h)	5m 28s
build-windows (ptl)	6m 18s
build-windows (-d, lnl)	6m 4s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 27s
build-windows (mtl lnl)	7m 19s
compare-linux-win	34s
	3h 24m 5s

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