CVE-2026-74468 gpio: pch: use raw_spinlock_t for the register lock

In the Linux kernel, the following vulnerability has been resolved: gpio: pch: use rawspinlockt for the register lock pchirqtype is registered as the irqchip .irqsettype callback and takes chip-spinlock with spinlockirqsave. This callback is reached from setupirq - irqsettrigger - chip-irqsettype...