ams: finish stdio -> fs bindings for stratosphere

stratosphere/loader/source/ldr_main.cpp

@@ -21,7 +21,6 @@ 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 0x8000
     size_t nx_inner_heap_size = INNER_HEAP_SIZE;
@@ -82,7 +81,6 @@ void __appInit(void) {
 
 void __appExit(void) {
     /* Cleanup services. */
-    fsdevUnmountAll();
     fsldrExit();
     lr::Finalize();
     fsExit();