x86: Interrupt handling not working for cores <> core0 - VMs not having core 0 assigned cannot handle IRQ events.

[michael1schmidt]

For Zephyr 2.7 it is not possible to handle interrupts properly on a multi core x86 system which is virtualized.
e.g. if there are 3 partition mode VMs that need to exchange data in a synchronous way with interrupts through shared memory.
The interrupt only can be triggered at core 0. All other cores assigned to different VMs than where core 0 is assigned cannot handle such events.

Backport PR #43691 would fix this problem.

v2.7 Backport: #43690
v2.7-auditable Backport: #43691