lnl: build all supporting code as LLEXT modules #945

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	5m 38s
build-windows (imx8 imx8x imx8m imx8ulp)	7m 56s
build-linux (mnfst, mtl)	4m 15s
build-windows (mtl)	6m 9s
build-linux (mnfst, lnl)	4m 4s
build-windows (tgl tgl-h)	7m 17s
build-linux (mnfst, tgl tgl-h)	4m 57s
build-windows (-d, mtl)	6m 17s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	5m 31s
build-linux (zmain, mtl)	3m 59s
LP64-WIP	3m 56s
build-linux (zmain, lnl)	3m 57s
build-linux (zmain, tgl tgl-h)	5m 9s
build-linux (-d, mnfst, mtl)	4m 15s
manifest-check	48s
build-linux (mnfst, --all)	9m 43s
compare-linux-win	40s
	1h 24m 31s

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