KVM: x86: Explicitly treat routing entry type changes as changes

Explicitly treat type differences as GSI routing changes, as comparing MSI
data between two entries could get a false negative, e.g. if userspace
changed the type but left the type-specific data as-is.

Fixes: 515a0c79 ("kvm: irqfd: avoid update unmodified entries of the routing")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250404193923.1413163-4-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>