rename DEBUG_TCG to CONFIG_DEBUG_TCG

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/tcg/tcg.h b/tcg/tcg.h
index ad0bd14..35e6aeb 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -121,7 +121,7 @@
    are aliases for target_ulong and host pointer sized values respectively.
  */
 
-#ifdef DEBUG_TCG
+#ifdef CONFIG_DEBUG_TCG
 #define DEBUG_TCGV 1
 #endif