fpga: Convert SYS_FPGA_CHECK_CTRLC to Kconfig

After commit 8cca60a2 ("Kconfig: Remove some symbols from the
whitelist") downstream builds failed for boards setting this in
include/configs/…

Signed-off-by: Alexander Dahl <ada@thorsis.com>
Link: https://lore.kernel.org/r/20220721133122.32428-2-ada@thorsis.com


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