Convert CONFIG_FPGA_STRATIX_V to Kconfig

This converts the following to Kconfig:
   CONFIG_FPGA_STRATIX_V

Signed-off-by: Tom Rini <trini@konsulko.com>

drivers/fpga/Kconfig

@@ -21,6 +21,12 @@ config FPGA_SOCFPGA
 
 	  This provides common functionality for Gen5 and Arria10 devices.
 
+config FPGA_STRATIX_V
+	bool "Enable Stratix V FPGA drivers"
+	depends on FPGA_ALTERA
+	help
+	  Say Y here to enable the Altera Stratix V FPGA specific driver.
+
 config FPGA_CYCLON2
 	bool "Enable Altera FPGA driver for Cyclone II"
 	depends on FPGA_ALTERA