drm/amdgpu: avoid buffer overflow attach in smu_sys_set_pp_table()

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UBUNTU-CVE-2025-21780

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: avoid buffer overflow attach in smusyssetpptable It malicious user provides a small pptable through sysfs and then a bigger pptable, it may cause buffer overflow attack in function smusyssetpptable...