CVE-2025-38297 PM: EM: Fix potential division-by-zero error in em_compute_costs()

In the Linux kernel, the following vulnerability has been resolved: PM: EM: Fix potential division-by-zero error in emcomputecosts When the device is of a non-CPU type, tablei.performance won't be initialized in the previous eminitperformance, resulting in division by zero when calculating costs ...