llext: use the new inspection API #19880

Job	Run time
manifest-check	52s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	3m 38s
build-windows (imx8 imx8x imx8m imx8ulp)	4m 59s
LP64-WIP	3m 37s
build-windows (mtl lnl)	5m 9s
build-windows (ptl)	4m 46s
build-linux (mnfst, mtl lnl)	4m 3s
build-windows (tgl tgl-h)	4m 39s
build-linux (mnfst, ptl)	3m 47s
build-windows (-d, lnl)	4m 58s
build-linux (mnfst, tgl tgl-h)	3m 46s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 26s
build-linux (zmain, mtl lnl)	4m 15s
build-linux (zmain, ptl)	4m 10s
build-linux (zmain, tgl tgl-h)	5m 29s
build-linux (-d, mnfst, lnl)	4m 7s
build-linux (mnfst, --all)	3m 45s
compare-linux-win	22s
	1h 12m 48s

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