fuzz: posix: widen fuzz framing length to 2 bytes #23734

Job	Run time
LP64-WIP	3m 29s
build-windows (-d, mnfst, lnl)	8m 54s
manifest-check	2m 51s
build-linux (mnfst, imx8m imx8ulp)	4m 15s
build-linux (mnfst, imx8 imx8x)	4m 24s
build-linux (mnfst, lnl)	3m 52s
build-windows (mnfst, tgl-h)	8m 17s
build-linux (mnfst, ptl)	5m 20s
build-windows (mnfst, mtl)	7m 56s
build-linux (mnfst, mtl)	4m 3s
build-windows (mnfst, imx8 imx8x)	8m 43s
build-windows (mnfst, ptl)	9m 5s
build-linux (-d, mnfst, lnl)	4m 1s
build-windows (mnfst, lnl)	7m 14s
build-linux (mnfst, wcl imx95)	5m 44s
build-windows (mnfst, imx8m imx8ulp)	9m 53s
build-linux (mnfst, tgl-h)	4m 8s
build-linux (mnfst, tgl)	4m 2s
build-windows (mnfst, tgl)	7m 25s
compare-linux-win	24s
	1h 54m 0s

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