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Currently it's not possible to get filesize of downloaded images and it's impossible to automate some tasks in scripts. So this patch adds `filesize` environment variable with size (as hex number in bytes) of the last successfully downloaded file via `sdp` command. Cc: Lukasz Majewski <lukma@denx.de> Cc: Marek Vasut <marex@denx.de> Cc: Stefan Agner <stefan.agner@toradex.com> Signed-off-by: Petr Štetiar <ynezz@true.cz> Reviewed-by: Stefan Agner <stefan.agner@toradex.com>