drm/amdgpu: handle amdgpu_cgs_create_device() errors in amd_powerplay_create()

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DEBIAN-CVE-2025-37852

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: handle amdgpucgscreatedevice errors in amdpowerplaycreate Add error handling to propagate amdgpucgscreatedevice failures to the caller. When amdgpucgscreatedevice fails, release hwmgr and return -ENOMEM to prevent nul...