CVE-2026-68332 net: airoha: Fix potential use-after-free in airoha_ppe_deinit()

In the Linux kernel, the following vulnerability has been resolved: net: airoha: Fix potential use-after-free in airohappedeinit airohappedeinit replaces the NPU pointer with NULL via rcureplacepointer but does not wait for existing RCU readers to exit before calling ppedeinit and airohanpuput...