[coreboot] RS780 dev3 detection

[Qing Pei Wang]

hi all,
  tilapila support both dual slot and single slot. The difference should be
detected by the existence of dev3. Some other RS780 mainboard has
the same function. The patch added the function to make these boards work
smoothly.

Signed-off-by: Wang Qing Pei <wangqingpei at gmail.com>

-- 
Wang Qing Pei
Phone: 86+13426369984
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