cirrusdrm: avoid using them

[Frederic Crozat]

Hi all,

udev hotplug handling in plymouth broke plymouth when used with system
with cirrus drm driver (ie mostly VM using qemu/kvm), since it will
avoid using framebuffer when a drm device is found for the same
framebuffer.

Currently, we don't have a way to "flag" a specific drm device in
plymouth so when fb device is tested, plymouth knows it is safe to
use.

I've done a "quick and dirty" patch to not report cirrusdrm as a
working drm device and it fixes the issue we have but it is obviously
not great (I'd prefer to avoid hardcoding driver name in the code) but
I couldn't make my mind on how to properly fix it.

So, in the mean time, feel free to use this patch ;)

-- 
Frederic Crozat
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