buf: use API for iteration bsource_list in components #421

Job	Run time
LP64-WIP	3m 54s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 6s
build-windows (mtl)	6m 11s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	7m 6s
build-windows (tgl tgl-h)	7m 24s
manifest-check	44s
build-linux (mnfst, mtl)	4m 26s
build-windows (-d, mtl)	5m 3s
build-linux (mnfst, lnl)	4m 7s
build-linux (mnfst, tgl tgl-h)	5m 3s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 2s
build-linux (zmain, mtl)	4m 23s
build-linux (zmain, lnl)	4m 20s
build-linux (zmain, tgl tgl-h)	5m 17s
build-linux (-d, mnfst, mtl)	4m 21s
build-linux (mnfst, --all)	9m 40s
compare-linux-win	48s
	1h 26m 55s

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