firmware: xilinx: Properly align function parameter

Fix parameters alignment reported by checkpatch --strict.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/00ed9fcb94a6c22eff1fe8afdea46b2764a8687d.1606894725.git.michal.simek@xilinx.com