ipc: ipc-helper: use list_mutex to guard buffer list in userspace LL #23076

Job	Run time
manifest-check	2m 52s
LP64-WIP	4m 17s
build-windows (mnfst, ptl)	10m 39s
build-windows (-d, mnfst, lnl)	9m 43s
build-windows (mnfst, imx8 imx8x)	10m 2s
build-windows (mnfst, lnl)	11m 1s
build-windows (mnfst, mtl)	9m 11s
build-linux (mnfst, mtl)	4m 27s
build-linux (mnfst, imx8 imx8x)	4m 59s
build-linux (mnfst, tgl)	4m 30s
build-windows (mnfst, tgl-h)	8m 5s
build-linux (mnfst, imx8m imx8ulp)	4m 56s
build-linux (mnfst, wcl imx95)	7m 8s
build-linux (mnfst, lnl)	4m 18s
build-windows (mnfst, imx8m imx8ulp)	10m 8s
build-windows (mnfst, tgl)	8m 22s
build-linux (mnfst, tgl-h)	4m 12s
build-linux (-d, mnfst, lnl)	4m 50s
build-linux (mnfst, ptl)	5m 41s
compare-linux-win	34s
	2h 9m 55s

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