llext: use the new inspection API #19944

Job	Run time
manifest-check	1m 2s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 45s
build-linux (mnfst, mtl lnl)	5m 54s
build-linux (mnfst, ptl)	4m 49s
build-linux (mnfst, tgl tgl-h)	5m 43s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 26s
build-linux (zmain, mtl lnl)	5m 54s
build-windows (imx8 imx8x imx8m imx8ulp)	9m 14s
build-linux (zmain, ptl)	4m 50s
build-windows (mtl lnl)	7m 32s
build-linux (zmain, tgl tgl-h)	6m 7s
build-windows (ptl)	6m 52s
build-linux (-d, mnfst, lnl)	4m 55s
build-windows (tgl tgl-h)	6m 50s
build-linux (mnfst, --all)	14m 33s
build-windows (-d, lnl)	6m 13s
LP64-WIP	4m 23s
compare-linux-win	32s
	1h 48m 34s

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