llext: use the new inspection API #19950

Job	Run time
LP64-WIP	4m 9s
manifest-check	51s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 31s
build-linux (mnfst, mtl lnl)	5m 53s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 23s
build-linux (mnfst, ptl)	4m 39s
build-windows (mtl lnl)	7m 12s
build-linux (mnfst, tgl tgl-h)	5m 37s
build-windows (ptl)	5m 36s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 43s
build-windows (tgl tgl-h)	7m 20s
build-linux (zmain, mtl lnl)	5m 50s
build-windows (-d, lnl)	6m 35s
build-linux (zmain, ptl)	5m 16s
build-linux (zmain, tgl tgl-h)	5m 36s
build-linux (-d, mnfst, lnl)	5m 12s
build-linux (mnfst, --all)	14m 36s
compare-linux-win	1m 20s
	1h 47m 19s

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