smart_amp_test: bound channel counts to platform max #23826

Job	Run time
manifest-check	2m 54s
build-windows (mnfst, tgl)	8m 32s
build-windows (mnfst, imx8 imx8x)	10m 14s
build-windows (-d, mnfst, lnl)	8m 27s
LP64-WIP	3m 40s
build-linux (mnfst, tgl-h)	3m 57s
build-windows (mnfst, ptl)	10m 4s
build-windows (mnfst, mtl)	9m 16s
build-linux (mnfst, imx8 imx8x)	4m 44s
build-linux (mnfst, ptl)	5m 33s
build-windows (mnfst, imx8m imx8ulp)	9m 52s
build-linux (mnfst, imx8m imx8ulp)	4m 25s
build-windows (mnfst, tgl-h)	7m 52s
build-linux (mnfst, tgl)	4m 4s
build-windows (mnfst, lnl)	8m 22s
build-linux (mnfst, mtl)	4m 11s
build-linux (mnfst, wcl imx95)	6m 5s
build-linux (mnfst, lnl)	4m 7s
build-linux (-d, mnfst, lnl)	4m 23s
compare-linux-win	27s
	2h 1m 9s

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