drm/radeon: add a force flush to delay work when radeon
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.19.258 by commit c0a45f41fde4a0f2c900f719817493ee5c4a5aa3. For more details please see the references link.