[PATCH] mx8m: csf.sh: Fix the calculation of fit_block_size

[sbabic at denx.de]

> From: Fabio Estevam <festevam at denx.de>
> When running the script to sign SPL/U-Boot on a kontron-sl-mx8mm board,
> the fit_block_size was calculated as 0x1000 instead of 0x1020.
> Add an extra parenthesis pair to fix it.
> Signed-off-by: Fabio Estevam <festevam at denx.de>
> Reviewed-by: Marek Vasut <marex at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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