buf: use API for iteration bsource_list in components #417

Job	Run time
build-windows (imx8 imx8x imx8m imx8ulp)	7m 22s
LP64-WIP	3m 44s
build-windows (mtl)	5m 54s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	5m 54s
build-windows (tgl tgl-h)	6m 23s
build-linux (mnfst, mtl)	4m 23s
build-windows (-d, mtl)	5m 32s
manifest-check	44s
build-linux (mnfst, lnl)	4m 27s
build-linux (mnfst, tgl tgl-h)	5m 8s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	5m 45s
build-linux (zmain, mtl)	4m 27s
build-linux (zmain, lnl)	4m 16s
build-linux (zmain, tgl tgl-h)	5m 15s
build-linux (-d, mnfst, mtl)	4m 26s
build-linux (mnfst, --all)	10m 9s
compare-linux-win	23s
	1h 24m 12s

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