drm/amd/display: Refactor DMCUB enter/exit idle interface

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CVE-2023-52625

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Refactor DMCUB enter/exit idle interface Why We can hang in place trying to send commands when the DMCUB isn't powered on. How We need to exit out of the idle state prior to sending a command, but the process tha...