ARM: keystone_defconfig: enable mdio and marvell eth phys

Enable MDIO support for Keystone 2 SoCs and also
enable Marvell Ethernet PHYs support for Keystone 2 K2H EVM
which has two 1G Marvell 88E1111-B2 PHYs installed.

For more information see:
- http://www.advantech.com/Support/TI-EVM/EVMK2HX.aspxSigned-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>

arch/arm/configs/keystone_defconfig

@@ -196,3 +196,5 @@ CONFIG_LEDS_TRIGGER_BACKLIGHT=y
 CONFIG_LEDS_TRIGGER_GPIO=y
 CONFIG_KEYSTONE_IRQ=y
 CONFIG_GPIO_SYSCON=y
+CONFIG_TI_DAVINCI_MDIO=y
+CONFIG_MARVELL_PHY=y