net: gem: Move gem to Kconfig

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index a03a95d..6905cc0 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -101,4 +101,10 @@
 	  This MAC is present in Intel Platform Controller Hub EG20T. It
 	  supports 10/100/1000 Mbps operation.
 
+config ZYNQ_GEM
+	depends on DM_ETH && (ARCH_ZYNQ || ARCH_ZYNQMP)
+	bool "Xilinx Ethernet GEM"
+	help
+	  This MAC is presetn in Xilinx Zynq and ZynqMP SoCs.
+
 endif # NETDEVICES