radeon_hd/atombios: Sync up to latest published atombios

Change-Id: Ic0b80da7fb88fabcc1a7e87fb055351a06aa4e68
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5528
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

radeon_hd: move some atombios headers to private/graphics

These will be needed to implement custom modes in the VESA driver.

Change-Id: I9b52de691baa14e1f1a3ccce500ced9bb040b113
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4622
Reviewed-by: waddlesplash <waddlesplash@gmail.com>