[FL-977] Internal Storage (#455)

* Add littlefs submodule
* Furi: add mutex in logging, fix issues with corrupted printf
* ApiHal: disable debug traces in ble glue
* App-loader: more logs
* Passport: fix invalid DolphinState usage
* ApiHal, linker script: flash API is now aware of free space, complete abstraction layer for storage
* Internal Storage: littlefs based storage services with key value API. Migrate dolphin state to new storage API.

applications/applications.c

@@ -34,6 +34,7 @@ int32_t keypad_test(void* p);
 int32_t scene_app(void* p);
 int32_t passport(void* p);
 int32_t app_accessor(void* p);
+int32_t internal_storage_task(void* p);
 
 // On system start hooks declaration
 void nfc_cli_init();
@@ -73,6 +74,13 @@ const FlipperApplication FLIPPER_SERVICES[] = {
     {.app = sd_filesystem, .name = "sd_filesystem", .stack_size = 4096, .icon = A_Plugins_14},
 #endif
 
+#ifdef SRV_INTERNAL_STORAGE
+    {.app = internal_storage_task,
+     .name = "internal_storage",
+     .stack_size = 2048,
+     .icon = A_Plugins_14},
+#endif
+
 #ifdef SRV_DOLPHIN
     {.app = dolphin_task, .name = "dolphin_task", .stack_size = 1024, .icon = A_Plugins_14},
 #endif