linuxkpi: Add spin_trylock_irqsave() macro

[nc]

Summary

This is needed by the drm-kmod 5.6 update

[manu]

Please explain what it does and why it's needed.

[nc]

On Linux, spin_trylock_irqsave() is used when you want to save the IRQ before doing a trylock, however we aren't doing this as we do in spin_trylock_irq(). This is called in the i915 part of the drm-kmod 5.7 update.

[• hselasky]

Looks good to me.