fpga: Convert SYS_FPGA_CHECK_CTRLC to Kconfig

After commit 8cca60a2cbf2 ("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>
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index 7671951..78d9588 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -91,4 +91,10 @@
 	  Enable FPGA driver for loading bitstream in BIT and BIN format
 	  on Xilinx Zynq devices.
 
+config SYS_FPGA_CHECK_CTRLC
+	bool "Allow Control-C to interrupt FPGA configuration"
+	depends on FPGA
+	help
+	  User can interrupt FPGA configuration by pressing CTRL+C.
+
 endmenu