drm/vc4: Use managed KMS polling to fix UAF on unbind

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{
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                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/vc4/vc4_kms.c"
                    ],
                    "versions": [
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                        },
                        {
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                            "version": "7.3",
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                            "versionType": "original_commit_for_fix"
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                }