amd-xgbe-phy: Let AMD_XGBE_PHY depend on HAS_IOMEM

The amd-xgbe-phy 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/phy/Kconfig b/drivers/net/phy/Kconfig
index 75472cf7..b4b0f80 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -26,7 +26,7 @@
 
 config AMD_XGBE_PHY
 	tristate "Driver for the AMD 10GbE (amd-xgbe) PHYs"
-	depends on OF
+	depends on OF && HAS_IOMEM
 	---help---
 	  Currently supports the AMD 10GbE PHY