drivers: imx: sai: Fix frame size computation #14610

Job	Run time
build-linux (mnfst, imx8 imx8x imx8m)	5m 34s
build-windows (imx8 imx8x imx8m)	10m 46s
build-linux (mnfst, tgl tgl-h)	6m 33s
LP64-WIP	5m 42s
build-windows (tgl tgl-h)	9m 48s
build-linux (mnfst, mtl)	5m 18s
build-windows (mtl)	9m 9s
build-linux (mnfst, lnl)	6m 5s
build-windows (-i IPC4 tgl tgl-h)	10m 0s
manifest-check	39s
build-linux (mnfst, -i IPC4 tgl tgl-h)	8m 44s
build-windows (-d, mtl)	7m 52s
build-linux (zmain, imx8 imx8x imx8m)	5m 21s
build-linux (zmain, tgl tgl-h)	6m 35s
build-linux (zmain, mtl)	6m 14s
build-linux (zmain, lnl)	5m 10s
build-linux (zmain, -i IPC4 tgl tgl-h)	6m 37s
build-linux (-d, mnfst, mtl)	5m 17s
compare-linux-win	1m 0s
	2h 2m 24s

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