[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.

firmware/targets/f5/api-hal/api-hal-flash.h

@@ -4,6 +4,51 @@
 #include <stdint.h>
 #include <stddef.h>
 
+/** Get flash base address
+ * @return pointer to flash base
+ */
+size_t api_hal_flash_get_base();
+
+/** Get flash read block size
+ * @return size in bytes
+ */
+size_t api_hal_flash_get_read_block_size();
+
+/** Get flash write block size
+ * @return size in bytes
+ */
+size_t api_hal_flash_get_write_block_size();
+
+/** Get flash page size
+ * @return size in bytes
+ */
+size_t api_hal_flash_get_page_size();
+
+/** Get expected flash cycles count
+ * @return count of erase-write operations 
+ */
+size_t api_hal_flash_get_cycles_count();
+
+/** Get free flash start address
+ * @return pointer to free region start
+ */
+const void* api_hal_flash_get_free_start_address();
+
+/** Get free flash end address
+ * @return pointer to free region end
+ */
+const void* api_hal_flash_get_free_end_address();
+
+/** Get first free page start address
+ * @return first free page memory address
+ */
+size_t api_hal_flash_get_free_page_start_address();
+
+/** Get free page count
+ * @return free page count
+ */
+size_t api_hal_flash_get_free_page_count();
+
 /*
  * Erase Flash
  * Locking operation, uses HSEM to manage shared access.
@@ -21,9 +66,9 @@ bool api_hal_flash_erase(uint8_t page, uint8_t count);
 bool api_hal_flash_write_dword(size_t address, uint64_t data);
 
 /*
- * Write page (4096 bytes or 64 rows of double words).
+ * Write double word (64 bits) from address
  * Locking operation, uses HSEM to manage shared access.
- * @param address - destination address, must be page aligned
+ * @param address - destination address, must be block aligned
  * @param source_address - source address
  */
-bool api_hal_flash_write_page(size_t address, size_t source_address);
+bool api_hal_flash_write_dword_from(size_t address, size_t source_address);