ptl: reduce the size of the shared buffer on ACE 3.0 #22086

Job	Run time
build-linux (mnfst, ptl)	5m 56s
manifest-check	3m 0s
build-windows (-d, lnl)	11m 6s
build-windows (imx8 imx8x imx8m imx8ulp)	14m 51s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 45s
build-linux (mnfst, tgl tgl-h)	5m 30s
build-windows (ptl)	10m 19s
build-windows (tgl tgl-h)	11m 42s
build-linux (zmain, mtl lnl)	5m 49s
build-linux (mnfst, mtl lnl)	5m 53s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 28s
build-windows (mtl lnl)	11m 5s
LP64-WIP	4m 5s
build-linux (zmain, tgl tgl-h)	5m 43s
build-linux (zmain, ptl)	5m 50s
build-linux (mnfst, wcl imx95)	7m 8s
build-linux (-d, mnfst, lnl)	4m 31s
compare-linux-win	53s
	2h 6m 34s

Provide feedback