amd-xgbe: Let AMD_XGBE depend on HAS_IOMEM

The amd-xgbe driver needs to perform ioremap calls, so add HAS_IOMEM
to its build dependency.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/amd/Kconfig b/drivers/net/ethernet/amd/Kconfig
index 8319c99..7a5e4aa 100644
--- a/drivers/net/ethernet/amd/Kconfig
+++ b/drivers/net/ethernet/amd/Kconfig
@@ -179,7 +179,7 @@
 
 config AMD_XGBE
 	tristate "AMD 10GbE Ethernet driver"
-	depends on OF_NET
+	depends on OF_NET && HAS_IOMEM
 	select PHYLIB
 	select AMD_XGBE_PHY
 	select BITREVERSE