There are now multiple plugins using drm_dp_aux_dev interface which
may potentially be combined with an amdgpu. Prevent exercising this
interface with any plugin using DP aux unless a new enough kernel is
installed.
The previous safety check was introduced due to a bug in the kernel
where it would produce a traceback and hang the offending process.
This code was fixed in kernel 5.2.0:
8ae5b1d78d
Add a new configuration option that will allow disabling the safety
checks if a new enough kernel is in place. This configuration option
is necessary because some Linux distributions may backport drm, and thus
this commit but still need the feature to work.
Also split out the firmware parsing to an object so we can check the firmware
using firmware-parse and also fuzz it.
See also: https://github.com/fwupd/fwupd/issues/1665
