mx6sxsabresd: Add Ethernet support

mx6sxsabresd board has 2 FEC ports, each one connected to a AR8031.

Add support for one FEC port initially.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/arch/arm/include/asm/arch-mx6/crm_regs.h b/arch/arm/include/asm/arch-mx6/crm_regs.h
index 9a7fb34..e67b5b9 100644
--- a/arch/arm/include/asm/arch-mx6/crm_regs.h
+++ b/arch/arm/include/asm/arch-mx6/crm_regs.h
@@ -981,6 +981,7 @@
 #define BM_ANADIG_PLL_ENET_RSVD1 0x7FE00000
 #define BF_ANADIG_PLL_ENET_RSVD1(v)  \
 	(((v) << 21) & BM_ANADIG_PLL_ENET_RSVD1)
+#define BM_ANADIG_PLL_ENET_REF_25M_ENABLE 0x00200000
 #define BM_ANADIG_PLL_ENET_ENABLE_SATA 0x00100000
 #define BM_ANADIG_PLL_ENET_ENABLE_PCIE 0x00080000
 #define BM_ANADIG_PLL_ENET_PFD_OFFSET_EN 0x00040000