Rename android/config.h to android/config-file.h

This is to avoid naming conflicts later when including
"config.h" in android/main.c to get the correct definition
of TARGET_X86 and other macros.

Change-Id: I4743bf207597721612386213208efe0c7e2f41c5
diff --git a/android/main.c b/android/main.c
index e0797d9..f2a55d3 100644
--- a/android/main.c
+++ b/android/main.c
@@ -33,7 +33,7 @@
 
 #include "android/charmap.h"
 #include "android/utils/debug.h"
-#include "android/config.h"
+#include "android/config-file.h"
 #include "android/config/config.h"
 
 #include "android/user-config.h"