ipc: Fix ipc_msg_send() with payload already prepared #22956

Job	Run time
manifest-check	2m 48s
LP64-WIP	3m 56s
build-windows (mnfst, imx8 imx8x)	11m 8s
build-linux (mnfst, imx8 imx8x)	4m 56s
build-windows (mnfst, lnl)	8m 2s
build-windows (mnfst, tgl-h)	9m 29s
build-windows (mnfst, imx8m imx8ulp)	10m 27s
build-windows (-d, mnfst, lnl)	8m 57s
build-windows (mnfst, mtl)	9m 11s
build-linux (mnfst, lnl)	4m 27s
build-linux (mnfst, mtl)	4m 40s
build-linux (mnfst, ptl)	5m 43s
build-windows (mnfst, tgl)	9m 41s
build-linux (mnfst, wcl imx95)	6m 50s
build-windows (mnfst, ptl)	10m 40s
build-linux (mnfst, tgl-h)	4m 5s
build-linux (mnfst, imx8m imx8ulp)	4m 58s
build-linux (-d, mnfst, lnl)	4m 25s
build-linux (mnfst, tgl)	4m 13s
compare-linux-win	29s
	2h 9m 5s

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