Some new fields and DESKTOP_HEIGHT register moved.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

The register bits changed on DCE8 compared to previous
families.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

CIK (DCE8) hw cursors are programmed the same as evergreen
(DCE4) with the following caveats:
- cursors are now 128x128 pixels
- new alpha blend enable bit

v2: rebase
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>