fix build errors when we enable acpi_piix4 debug

I enable acpi_piix4 debug, and got the following build errors:
# make
  CC    libhw64/acpi_piix4.o
cc1: warnings being treated as errors
/home/wency/source/qemu/hw/acpi_piix4.c: In function ‘pm_ioport_write’:
/home/wency/source/qemu/hw/acpi_piix4.c:193: error: format ‘%04x’ expects type ‘unsigned int’, but argument 2 has type ‘uint64_t’
/home/wency/source/qemu/hw/acpi_piix4.c:193: error: format ‘%04x’ expects type ‘unsigned int’, but argument 3 has type ‘uint64_t’
/home/wency/source/qemu/hw/acpi_piix4.c: In function ‘pm_ioport_read’:
/home/wency/source/qemu/hw/acpi_piix4.c:219: error: format ‘%04x’ expects type ‘unsigned int’, but argument 2 has type ‘uint64_t’
make[1]: *** [acpi_piix4.o] Error 1
make: *** [subdir-libhw64] Error 2
Signed-off-by: NWen Congyang <wency@cn.fujitsu.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

hw/acpi_piix4.c

@@ -190,7 +190,8 @@ static void pm_ioport_write(IORange *ioport, uint64_t addr, unsigned width,
     default:
         break;
     }
-    PIIX4_DPRINTF("PM writew port=0x%04x val=0x%04x\n", addr, val);
+    PIIX4_DPRINTF("PM writew port=0x%04x val=0x%04x\n", (unsigned int)addr,
+                  (unsigned int)val);
 }
 
 static void pm_ioport_read(IORange *ioport, uint64_t addr, unsigned width,
@@ -216,7 +217,7 @@ static void pm_ioport_read(IORange *ioport, uint64_t addr, unsigned width,
         val = 0;
         break;
     }
-    PIIX4_DPRINTF("PM readw port=0x%04x val=0x%04x\n", addr, val);
+    PIIX4_DPRINTF("PM readw port=0x%04x val=0x%04x\n", (unsigned int)addr, val);
     *data = val;
 }