ipc4: notification: Fix include guard #693

Job	Run time
manifest-check	45s
LP64-WIP	3m 59s
build-windows (mtl lnl)	7m 22s
build-windows (tgl tgl-h)	6m 35s
build-windows (ptl)	5m 55s
build-linux (mnfst, tgl tgl-h)	5m 22s
build-linux (mnfst, mtl lnl)	5m 47s
build-linux (zmain, mtl lnl)	6m 23s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 25s
build-linux (mnfst, ptl)	5m 12s
build-linux (zmain, tgl tgl-h)	5m 29s
build-windows (-d, lnl)	5m 39s
build-linux (-d, mnfst, lnl)	4m 56s
build-linux (mnfst, --all)	12m 47s
build-linux (zmain, ptl)	4m 26s
build-windows (imx8 imx8x imx8m imx8ulp)	8m 29s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 44s
compare-linux-win	30s
	1h 42m 45s

Provide feedback