fuzz: posix: widen fuzz framing length to 2 bytes #23773

Job	Run time
manifest-check	2m 56s
build-windows (mnfst, tgl)	8m 8s
LP64-WIP	3m 44s
build-windows (-d, mnfst, lnl)	8m 41s
build-windows (mnfst, ptl)	10m 3s
build-windows (mnfst, lnl)	8m 31s
build-windows (mnfst, mtl)	7m 38s
build-windows (mnfst, imx8 imx8x)	9m 34s
build-windows (mnfst, tgl-h)	8m 56s
build-linux (mnfst, ptl)	5m 38s
build-linux (mnfst, lnl)	4m 1s
build-linux (mnfst, wcl imx95)	5m 54s
build-linux (mnfst, imx8m imx8ulp)	4m 23s
build-linux (mnfst, tgl-h)	3m 59s
build-linux (-d, mnfst, lnl)	4m 27s
build-linux (mnfst, mtl)	4m 23s
build-linux (mnfst, tgl)	3m 56s
build-linux (mnfst, imx8 imx8x)	4m 44s
build-windows (mnfst, imx8m imx8ulp)	10m 23s
compare-linux-win	24s
	2h 0m 23s

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