x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.91 by commit 0b08201158f177aab469e356b4d6af24fdd118df, it was introduced in version v2.6.18 by commit a4633adcdbc15ac51afcd0e1395de58cee27cf92. For more details please see the references link.