misc: Add gdsys_ioep driver

Add driver for the IHS IO endpoint on IHS FPGAs.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index c031dfd..6bcd49a 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -277,4 +277,10 @@
 	depends on MISC
 	help
 	  Support gdsys FPGA's RXAUI control.
+
+config GDSYS_IOEP
+	bool "Enable gdsys IOEP driver"
+	depends on MISC
+	help
+	  Support gdsys FPGA's IO endpoint driver.
 endmenu