cmd: fpga: Remove parameter checking from fpga loadfs command

cmd: fpga: Remove parameter checking from fpga loadfs command

Parameter checking is dead code because all the time there must be all
params assigned. If they are not assigned there is no 9th parameters
passed and checking before return CMD_RET_USAGE.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>