boards/t1040qds: Adds ethernet support for T1040

Enable entherent for T1040QDS. It enables FM1@DTSEC3, FM1@DTSEC4, FM1@DTSEC5
    Define MDIO related configs
    Added eth.c file
    Update t1040.c to support RGMII and SGMII
    Update t1040qds.c to support ethernet
    Define the PHY address

Signed-off-by: Arpit Goel <B44344@freescale.com>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
[York Sun: remove dash from commit message]
Signed-off-by: York Sun <yorksun@freescale.com>