Bug#980785: linux-image-5.10.0-1-arm64: vc4.ko garbles screen ouput on raspi 4B

[Ryutaroh Matsumoto <ryutaroh@ict.e.titech.ac.jp>]

The emails related to this symptom and pathces have appeared in the dri-devel
mailing list as below:

https://lists.freedesktop.org/archives/dri-devel/2021-January/295093.html
https://lists.freedesktop.org/archives/dri-devel/2021-January/295094.html
https://lists.freedesktop.org/archives/dri-devel/2021-January/295083.html
https://lists.freedesktop.org/archives/dri-devel/2021-January/295086.html
https://lists.freedesktop.org/archives/dri-devel/2021-January/295111.html
https://lists.freedesktop.org/archives/dri-devel/2021-January/295121.html
https://lists.freedesktop.org/archives/dri-devel/2021-January/295122.html

Ryutaroh