🛡️ Sentinel: [MEDIUM] Fix unbounded strcpy in ar8327 LED driver

[ManupaKDU]

🚨 Severity: MEDIUM
💡 Vulnerability: Unbounded strcpy in ar8327_led_create could lead to buffer overflows when copying the LED name into a dynamically allocated flexible array member. Additionally, strlen was called separately during allocation and copying, potentially leading to TOCTOU races if the name changed in the interim.
🎯 Impact: Potential kernel memory corruption or out-of-bounds writes if a maliciously crafted or overly long LED name is provided via the device tree or other initialization paths.
🔧 Fix: Replaced strcpy with strscpy, precalculated the name length in a local variable name_len, and used it for both memory allocation and bounds checking in strscpy.
✅ Verification: Verified that the patch applies cleanly, strscpy correctly bounds the copy, and no syntax errors or regressions were introduced. Run sh test_ci.sh locally.

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PR created automatically by Jules for task 3457645063388007658 started by @manupawickramasinghe

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