audio: copier: avoid serializing uninitialized stream position to host #23369

Job	Run time
LP64-WIP	3m 30s
manifest-check	2m 41s
build-windows (mnfst, tgl)	11m 29s
build-windows (mnfst, ptl)	10m 48s
build-windows (mnfst, tgl-h)	8m 26s
build-windows (-d, mnfst, lnl)	10m 54s
build-linux (mnfst, imx8 imx8x)	4m 37s
build-linux (mnfst, lnl)	4m 30s
build-windows (mnfst, lnl)	8m 57s
build-linux (mnfst, ptl)	6m 6s
build-linux (mnfst, tgl-h)	4m 8s
build-linux (-d, mnfst, lnl)	4m 23s
build-linux (mnfst, tgl)	4m 27s
build-linux (mnfst, wcl imx95)	7m 11s
build-windows (mnfst, imx8m imx8ulp)	10m 24s
build-linux (mnfst, mtl)	4m 27s
build-linux (mnfst, imx8m imx8ulp)	4m 51s
build-windows (mnfst, imx8 imx8x)	8m 44s
build-windows (mnfst, mtl)	9m 3s
compare-linux-win	32s
	2h 10m 8s

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