Remove count option in dd commands for OMAP boards
    
    The dd commands for the OMAP boards use a "count" option, which limits how
    much of the u-boot binaries are written to the storage media. But that is
    not really needed since dd will write the size of the bootloader binaries.
    
    What's important is to have the "bs" and "seek" options, because there are
    specific offsets on which the MLO and u-boot.img binaries must te placed.
    
    But the "count" may even be harmfull, since for example will cause to not
    write the whole u-boot.img binary if its size is bigger than 2 * 384k.
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>