lib-manager: llext: remove entry point functions #21141

Job	Run time
LP64-WIP	3m 38s
manifest-check	49s
build-windows (ptl)	7m 20s
build-windows (imx8 imx8x imx8m imx8ulp)	9m 18s
build-windows (-d, lnl)	7m 11s
build-windows (mtl lnl)	8m 16s
build-linux (mnfst, tgl tgl-h)	5m 21s
build-windows (tgl tgl-h)	7m 46s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 8s
build-linux (zmain, tgl tgl-h)	4m 55s
build-linux (zmain, ptl)	4m 41s
build-linux (mnfst, mtl lnl)	5m 42s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 37s
build-linux (mnfst, ptl)	4m 22s
build-linux (zmain, mtl lnl)	5m 42s
build-linux (-d, mnfst, lnl)	4m 25s
build-linux (mnfst, --all)	16m 27s
compare-linux-win	1m 27s
	1h 50m 5s

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