fpga: xilinx exclusive commands

Ensure all Xilinx exclusive fpga commands have a KConfig symbol and
dependency to FPGA_XILINX listed. Remove (Xilinx only) text from the
help command.

Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@amd.com>
Link: https://lore.kernel.org/r/20250121130138.1999916-5-ibai.erkiaga-elorza@amd.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
2 files changed