spl: socfpga: Generate Arria10 SFP header V1

Generate SoCFPGA boot header version 1 instead of version 0 for Arria10.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Chin Liang See <chin.liang.see@intel.com>