[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/internal-storage/internal-storage-i.h

@@ -0,0 +1,62 @@
+#pragma once
+
+#include "internal-storage.h"
+#include <furi.h>
+#include <api-hal.h>
+#include <lfs.h>
+
+#define INTERNAL_STORAGE_THREAD_FLAG_CALL_COMPLETE (1)
+
+struct InternalStorage {
+    osMessageQueueId_t queue;
+    InternalStorageState state;
+    const size_t start_address;
+    const size_t start_page;
+    struct lfs_config config;
+    lfs_t lfs;
+};
+
+typedef struct {
+    const char* key;
+    uint8_t* buffer;
+    size_t size;
+    int ret;
+} InternalStorageCommandKey;
+
+typedef void (*InternalStorageCommandFunction)(InternalStorage* internal_storage, void* data);
+
+typedef struct {
+    osThreadId thread;
+    InternalStorageCommandFunction function;
+    void* data;
+} InternalStorageCommand;
+
+int internal_storage_device_read(
+    const struct lfs_config* c,
+    lfs_block_t block,
+    lfs_off_t off,
+    void* buffer,
+    lfs_size_t size);
+
+int internal_storage_device_prog(
+    const struct lfs_config* c,
+    lfs_block_t block,
+    lfs_off_t off,
+    const void* buffer,
+    lfs_size_t size);
+
+int internal_storage_device_erase(const struct lfs_config* c, lfs_block_t block);
+
+int internal_storage_device_sync(const struct lfs_config* c);
+
+InternalStorage* internal_storage_alloc();
+
+void internal_storage_free(InternalStorage* internal_storage);
+
+int32_t internal_storage_task(void* p);
+
+void _internal_storage_read_key(InternalStorage* internal_storage, InternalStorageCommandKey* data);
+
+void _internal_storage_write_key(
+    InternalStorage* internal_storage,
+    InternalStorageCommandKey* data);