drm/amdgpu: invoke pm_genpd_remove() before freeing genpd

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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c"
                    ],
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                }