On UML builds, mdio-mux-mmioreg.c fails to compile:

drivers/net/phy/mdio-mux-mmioreg.c:50:3: error: implicit declaration of 
function ‘ioremap’ [-Werror=implicit-function-declaration]
drivers/net/phy/mdio-mux-mmioreg.c:63:3: error: implicit declaration of 
function ‘iounmap’ [-Werror=implicit-function-declaration]

This is due to CONFIG_OF now being user selectable. Add a dependency on
HAS_IOMEM to fix this.

Signed-off-by: Rob Herring <r...@kernel.org>
Cc: Florian Fainelli <f.faine...@gmail.com>
Cc: David S. Miller <da...@davemloft.net>
---
 drivers/net/phy/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index cf18940..cb86d7a 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -191,7 +191,7 @@ config MDIO_BUS_MUX_GPIO
 
 config MDIO_BUS_MUX_MMIOREG
        tristate "Support for MMIO device-controlled MDIO bus multiplexers"
-       depends on OF_MDIO
+       depends on OF_MDIO && HAS_IOMEM
        select MDIO_BUS_MUX
        help
          This module provides a driver for MDIO bus multiplexers that
-- 
2.1.0

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