* add missing header for some radeon registers
* begin removing now un-needed direct register calls
* move and refactor crtc functions
* fix function naming to be clearer
* create more AtomBIOS style calls
* this will eat your cat at the moment, don't bother testing
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42582 a95241bf-73f2-0310-859d-f6bbb57e9c96
