ozone/drm: Support upstream AFBC

AFBC (ARM Frame Buffer Compression) is supported for Rockchip RK3399
devices, using the DRM_FORMAT_MOD_ARM_AFBC modifier on recent kernels.

The underlying bug from crbug.com/852675 was never fixed (just worked
around here), so we need to carry the workaround to the new
kernel/modifier.

Update the TODOs while we're at it:
* b/172227166 - AFBC modeset issues
* b/214459790 - Clean up the old 4.4 kernel modifiers

BUG=b:214459790, b:172227166
TEST=UI/graphics on kevin (RK3399)

Change-Id: Ia16d4841467a45e35f6ea9579a3753b39c4eb2d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3615263
Reviewed-by: Mark Yacoub <markyacoub@google.com>
Commit-Queue: Brian Norris <briannorris@chromium.org>
Cr-Commit-Position: refs/heads/main@{#998980}