KVM: x86: Move posted interrupt tracepoint to common code

Move the pi_irte_update tracepoint to common x86, and call it whenever the
IRTE is modified.  Tracing only the modifications that result in an IRQ
being posted to a vCPU makes the tracepoint useless for debugging.

Drop the vendor specific address; plumbing that into common code isn't
worth the trouble, as the address is meaningless without a whole pile of
other information that isn't provided in any tracepoint.

Link: https://lore.kernel.org/r/20250611224604.313496-31-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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