ipc3: Fix spinlock violation in PM context save on fuzzer #21159

Job	Run time
LP64-WIP	3m 51s
manifest-check	47s
build-windows (-d, lnl)	7m 41s
build-windows (tgl tgl-h)	7m 6s
build-linux (mnfst, tgl tgl-h)	5m 27s
build-linux (mnfst, mtl lnl)	5m 54s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 43s
build-windows (imx8 imx8x imx8m imx8ulp)	11m 24s
build-linux (mnfst, --all)	15m 58s
build-linux (zmain, ptl)	4m 48s
build-linux (-d, mnfst, lnl)	4m 24s
build-windows (ptl)	7m 24s
build-windows (mtl lnl)	9m 28s
build-linux (zmain, tgl tgl-h)	5m 29s
build-linux (zmain, mtl lnl)	5m 46s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 37s
build-linux (mnfst, ptl)	5m 7s
compare-linux-win	1m 28s
	1h 55m 22s

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