powerpc/pseries: Honor the generic "no_64bit_msi" flag

commit 415072a0 upstream.

Instead of the arch specific quirk which we are deprecating
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

arch/powerpc/platforms/pseries/msi.c

@@ -428,7 +428,7 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
 	 */
 again:
 	if (type == PCI_CAP_ID_MSI) {
-		if (pdn->force_32bit_msi) {
+		if (pdev->no_64bit_msi) {
 			rc = rtas_change_msi(pdn, RTAS_CHANGE_32MSI_FN, nvec);
 			if (rc < 0) {
 				/*