spinlock: handle missing raw-spin symbols for KP-owned locks

[qssn70]

On kernels that inline the generic _raw_spin_* wrappers, kallsyms lookup leaves the function pointers unset and the first task-extension lock acquisition can branch to address zero. This failure was isolated on Xiaomi Mi MIX 2S (polaris), Linux 4.9.327, as documented in bmax121/KernelPatch#302, which has been merged upstream.

This ports that fix unchanged (upstream commit b77855640f80c6c0af706a9e20aa5c8a203145d6) onto LyraVoid main at 1de1a37.

• Use the native _raw_spin_lock_irqsave / _raw_spin_unlock_irqrestore pair when both resolve.
• Otherwise save DAIF, mask IRQs, acquire a local 0/1 TAS lock, release with store-release, and restore DAIF.
• Route taskob and kstorage private locks through the paired helpers. The fallback is restricted to zero-initialized KP-owned locks; the generic spinlock API is unchanged.

Validation for this port: the upstream patch applies without conflicts, all four changed files have the same resulting contents as the upstream fix, and git diff --cached --check passes. The upstream PR documents ARM64 compilation/disassembly checks and device boot evidence for the fallback prototype. This LyraVoid-based commit has not been rebuilt or device-tested; boot and concurrent task/kstorage testing remain to be done.

Scope: four files, 96 additions and 14 deletions. No other upstream commits are included.