powerpc/powernv: Honor the generic "no_64bit_msi" flag

Instead of the arch specific quirk which we are deprecating
and that drivers don't understand.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 468a0f2..7a8e806 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1509,7 +1509,6 @@
 				  unsigned int is_64, struct msi_msg *msg)
 {
 	struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
-	struct pci_dn *pdn = pci_get_pdn(dev);
 	unsigned int xive_num = hwirq - phb->msi_base;
 	__be32 data;
 	int rc;
@@ -1523,7 +1522,7 @@
 		return -ENXIO;
 
 	/* Force 32-bit MSI on some broken devices */
-	if (pdn && pdn->force_32bit_msi)
+	if (dev->no_64bit_msi)
 		is_64 = 0;
 
 	/* Assign XIVE to PE */