[RFC] remove post-mixout gain for playback #92

Job	Run time
manifest-check	35s
LP64-WIP	5m 24s
build-linux (mnfst, imx8 imx8x imx8m)	5m 52s
build-linux (mnfst, tgl tgl-h)	8m 14s
build-linux (mnfst, mtl)	6m 25s
build-linux (mnfst, lnl)	5m 17s
build-linux (mnfst, -i IPC4 tgl tgl-h)	7m 28s
build-linux (zmain, imx8 imx8x imx8m)	6m 50s
build-linux (zmain, tgl tgl-h)	7m 38s
build-linux (zmain, mtl)	5m 9s
build-linux (zmain, lnl)	5m 6s
build-linux (zmain, -i IPC4 tgl tgl-h)	7m 18s
build-linux (-d, mnfst, mtl)	5m 21s
build-windows (imx8 imx8x imx8m)	11m 32s
build-windows (tgl tgl-h)	12m 4s
build-windows (mtl)	10m 42s
build-windows (-i IPC4 tgl tgl-h)	13m 47s
build-windows (-d, mtl, mnfst)	11m 47s
compare-linux-win	41s
	2h 17m 10s

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