pci: Correct cast for sandbox

This gives a warning with some native compilers:

cmd/pci.c:152:11: warning: format ‘%llx’ expects argument of type
   ‘long long unsigned int’, but argument 3 has type
   ‘u64 {aka long unsigned int}’ [-Wformat=]

Fix it with a cast.

Signed-off-by: Simon Glass <sjg@chromium.org>

cmd/pci.c

@@ -150,7 +150,8 @@ int pci_bar_show(struct udevice *dev)
 		if ((!is_64 && size_low) || (is_64 && size)) {
 			size = ~size + 1;
 			printf(" %d   %#016llx  %#016llx  %d     %s   %s\n",
-			       bar_id, base, size, is_64 ? 64 : 32,
+			       bar_id, (unsigned long long)base,
+			       (unsigned long long)size, is_64 ? 64 : 32,
 			       is_io ? "I/O" : "MEM",
 			       prefetchable ? "Prefetchable" : "");
 		}