pci.c: fix compile warning

pci/pci.c:1128:15: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'uint32_t' {aka 'long unsigned int'} [-Wformat=]
 1128 |       pciinfo("Limit MME to %x, num to %d\n", mmc, num);
      |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  ~~~
      |                                               |
      |                                               uint32_t {aka long unsigned int}
pci/pci.c:1128:30: note: format string is defined here
 1128 |       pciinfo("Limit MME to %x, num to %d\n", mmc, num);
      |                             ~^
      |                              |
      |                              unsigned int
      |                             %lx

Signed-off-by: Yongrong Wang <wangyongrong@xiaomi.com>

drivers/pci/pci.c

@@ -1127,7 +1127,7 @@ static int pci_enable_msi(FAR struct pci_device_s *dev, FAR int *irq,
     {
       mme = mmc;
       num = 1 << mme;
-      pciinfo("Limit MME to %x, num to %d\n", mmc, num);
+      pciinfo("Limit MME to %"PRIx32", num to %d\n", mmc, num);
     }
 
   /* Configure MSI (arch-specific) */