tools: socfpgaimage: Print image header information
Print image header information if the header is verified.
Example output from mkimage "-l" option:
$ ./tools/mkimage -l spl/u-boot-spl.sfp
Image Type : Cyclone V / Arria V SoC Image
Validation word : 0x31305341
Version : 0x00000000
Flags : 0x00000000
Program length : 0x00003a59
Header checksum : 0x00000188
$ ./tools/mkimage -l spl/u-boot-spl.sfp
Image Type : Arria 10 SoC Image
Validation word : 0x31305341
Version : 0x00000001
Flags : 0x00000000
Header length : 0x00000014
Program length : 0x000138e0
Program entry : 0x00000014
Header checksum : 0x00000237
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>