* Caching these values could result in missed
state changes.
* We may want to re-implement later.
* Highlights that all DP AUX communication is broken
during my testing.
* Now pulling in latest amdgpu atombios.h headers
* Lots of DisplayPort cleanup and removal of legacy stuff
* Add obsolete atombios header for things that disappear
(amdgpu doesn't support older cards like we do)
* Introduce new code to support later encoder tables
* Drop radeon-specific encoder service from common dp_info
* Tested on HD 5450 hdmi
* 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.
