ARM: stm32: enable support for smsc phy on stm32f746-disco board

This patch enables support for the smsc phy on the
stm32f746-disco board.

Signed-off-by: Michael Kurz <michi.kurz@gmail.com>
Acked-by: Vikas MANOCHA <vikas.manocha@st.com>

Series-changes 3:
- Add Acked-by tag to 'enable support for smsc phy on...'

include/configs/stm32f746-disco.h

@@ -44,6 +44,7 @@
 #define CONFIG_DW_GMAC_DEFAULT_DMA_PBL	(8)
 #define CONFIG_DW_ALTDESCRIPTOR
 #define CONFIG_MII
+#define CONFIG_PHY_SMSC
 
 #define CONFIG_STM32_HSE_HZ		25000000
 #define CONFIG_SYS_CLK_FREQ		200000000 /* 200 MHz */