vregion: allocate the metadata separately #23220

Job	Run time
LP64-WIP	4m 20s
manifest-check	3m 31s
build-linux (mnfst, tgl-h)	4m 14s
build-linux (mnfst, ptl)	6m 34s
build-windows (mnfst, tgl)	8m 50s
build-windows (mnfst, mtl)	9m 4s
build-windows (mnfst, ptl)	10m 48s
build-windows (mnfst, imx8 imx8x)	11m 10s
build-linux (mnfst, imx8 imx8x)	4m 50s
build-linux (-d, mnfst, lnl)	4m 49s
build-windows (-d, mnfst, lnl)	10m 17s
build-linux (mnfst, lnl)	4m 34s
build-windows (mnfst, lnl)	9m 52s
build-linux (mnfst, wcl imx95)	6m 52s
build-linux (mnfst, tgl)	6m 1s
build-linux (mnfst, imx8m imx8ulp)	5m 6s
build-linux (mnfst, mtl)	4m 55s
build-windows (mnfst, tgl-h)	8m 58s
build-windows (mnfst, imx8m imx8ulp)	10m 16s
compare-linux-win	30s
	2h 15m 31s

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