[coreboot] [PATCH] Gigabyte MA785GMT support

[Qing Pei Wang]

hi,
  the attach file added the support of Gigabyte MA785GMT mainboard.
the details of the hardware configuration can be found at
http://www.gigabyte.com/products/product-page.aspx?pid=3478
a breif configuration is:
1. CPU:Support for AM3 processors: AMD PhenomTM II processor/ AMD Athlon™ II
processor
2. North Bridge: AMD 785G
3. South Bridge: AMD SB710
4: Super IO : ITE8718F

The mainboard has two bios flashchip. Coreboot ROM should be flashed into
the M_BIOS(which means main bios).
signed-off-by Wang Qing Pei