platform: acp_7_x: add placeholder for platform-specific headers #23292

Job	Run time
manifest-check	2m 52s
LP64-WIP	3m 54s
build-windows (mnfst, mtl)	8m 52s
build-windows (mnfst, tgl)	8m 12s
build-windows (mnfst, lnl)	9m 47s
build-windows (mnfst, imx8 imx8x)	9m 51s
build-windows (mnfst, imx8m imx8ulp)	11m 3s
build-windows (mnfst, ptl)	11m 8s
build-windows (-d, mnfst, lnl)	9m 59s
build-linux (mnfst, imx8 imx8x)	52s
build-linux (mnfst, mtl)	4m 23s
build-linux (mnfst, tgl)	4m 14s
build-linux (mnfst, imx8m imx8ulp)	4m 52s
build-windows (mnfst, tgl-h)	8m 28s
build-linux (mnfst, wcl imx95)	7m 15s
build-linux (-d, mnfst, lnl)	4m 7s
build-linux (mnfst, lnl)	4m 22s
build-linux (mnfst, ptl)	5m 39s
build-linux (mnfst, tgl-h)	4m 18s
compare-linux-win	26s
	2h 4m 34s

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