powerpc/powernv/pci: Adapt is_pnv_opal_msi() to detect passthrough interrupt

The pnv_ioda2_msi_eoi() chip handler is not used anymore for MSIs.
Simply use the check on the PSI-MSI chip.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210701132750.1475580-27-clg@kaod.org

arch/powerpc/platforms/powernv/pci-ioda.c

@@ -2015,7 +2015,7 @@ static struct irq_chip pnv_pci_msi_irq_chip;
  */
 bool is_pnv_opal_msi(struct irq_chip *chip)
 {
-	return chip->irq_eoi == pnv_ioda2_msi_eoi || chip == &pnv_pci_msi_irq_chip;
+	return chip == &pnv_pci_msi_irq_chip;
 }
 EXPORT_SYMBOL_GPL(is_pnv_opal_msi);