Rename HAVE_FDT to CONFIG_FDT and define it also in Makefile

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 04c6acd..d154c7f 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/hw/ppce500_mpc8544ds.c
@@ -46,7 +46,7 @@
 #define MPC8544_PCI_IO             0xE1000000
 #define MPC8544_PCI_IOLEN          0x10000
 
-#ifdef HAVE_FDT
+#ifdef CONFIG_FDT
 static int mpc8544_copy_soc_cell(void *fdt, const char *node, const char *prop)
 {
     uint32_t cell;
@@ -77,7 +77,7 @@
                                      const char *kernel_cmdline)
 {
     void *fdt = NULL;
-#ifdef HAVE_FDT
+#ifdef CONFIG_FDT
     uint32_t mem_reg_property[] = {0, ramsize};
     char *filename;
     int fdt_size;