llext: use the new inspection API #19948

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 51s
LP64-WIP	4m 6s
build-windows (imx8 imx8x imx8m imx8ulp)	9m 24s
build-linux (mnfst, mtl lnl)	5m 43s
manifest-check	53s
build-windows (mtl lnl)	7m 1s
build-linux (mnfst, ptl)	4m 38s
build-windows (ptl)	6m 16s
build-linux (mnfst, tgl tgl-h)	5m 48s
build-windows (tgl tgl-h)	6m 45s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 46s
build-windows (-d, lnl)	6m 29s
build-linux (zmain, mtl lnl)	6m 39s
build-linux (zmain, ptl)	5m 4s
build-linux (zmain, tgl tgl-h)	5m 39s
build-linux (-d, mnfst, lnl)	4m 34s
build-linux (mnfst, --all)	14m 32s
compare-linux-win	1m 41s
	1h 48m 49s

Provide feedback