fpga: zynq: Remove post config info message for SPL

The drivers informs the user that a post config was not run after FPGA
configuration. This message is unnecessary in SPL because the
ps7_post_config function is called via spl_board_prepare_for_boot
function before jump_to_image_no_args function from board_init_r
function.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Link: https://lore.kernel.org/r/20220808145331.24723-1-stefan.herbrechtsmeier-oss@weidmueller.com


Signed-off-by: Michal Simek <michal.simek@amd.com>