[Trac #734] Use dot-clock divider in DCON mode

[Zarro Boogs per Child]

#734: Use dot-clock divider in DCON mode
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 Reporter:  dwmw2        |       Owner:  JordanCrouse
     Type:  enhancement  |      Status:  new         
 Priority:  normal       |   Milestone:  BTest-3     
Component:  display      |    Keywords:              
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 We should slow down the dot clock when driving the panel in DCON mode.
 It'll save power.
 We just have to set the appropriate DCON registers.

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Ticket URL: <http://dev.laptop.org/ticket/734>
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