ams: finish stdio -> fs bindings for stratosphere

stratosphere/fatal/source/fatal_main.cpp

@@ -23,7 +23,6 @@ extern "C" {
 
     u32 __nx_applet_type = AppletType_None;
     u32 __nx_fs_num_sessions = 1;
-    u32 __nx_fsdev_direntry_cache_size = 1;
 
     #define INNER_HEAP_SIZE 0x240000
     size_t nx_inner_heap_size = INNER_HEAP_SIZE;