[PATCH] Makefile: Fix generation of flash.bin u-boot.itb with binman

[stefano.babic at babic.homelinux.org]

> In case binman is enabled, the u-boot.itb is generated using this tool
> and there is no direct u-boot.itb target, but instead the binman tool
> must be invoked. Add support for this case.
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Stefano Babic <sbabic at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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