* Remove non-generic radeon dp_get_lane_count
* Set lane count and link rate at set_display_mode
* Pass entire mode to pll_set vs only pixel clock for DP code
* Add helpers for DP config data to common code
* Obtain more correct link rate
* General DisplayPort functions in common dp.cpp
* DP port information struct in common header
* Please don't use this private accelerant common DP
code just yet as it is very early.