[FL-1952] BLE bonding fix (#805)

* furi-hal-bt: add mutex guarding core2 state
* ble-glue: configure ble keys storage in SRAM2
* bt: add load and save ble keys in internal storage
* bt: improve work furi_hal_bt API
* bt: rework app_entry -> ble_glue
* bt: apply changes for f6 target
* desktop: remove furi check
* ble-glue: comment NVM in SRAM2 configuration
* FuriHal: fix flash controller state corruption, fix incorrect semaphore release, implement C1-C2 flash controller access according to spec. Gui: change logging level.
* Libs: better lfs integration with lfs_config.
* Ble: switch C2 NVM to RAM.
* FuriHalCrypto: ensure that core2 is alive before sending shci commands
* Ble: fix incorrect nvm buffer size

Co-authored-by: あく <alleteam@gmail.com>

firmware/targets/furi-hal-include/furi-hal-bt.h

@@ -9,6 +9,9 @@
 #include <stdbool.h>
 #include <gap.h>
 #include <serial_service.h>
+#include <ble_glue.h>
+#include <ble_app.h>
+
 
 #define FURI_HAL_BT_PACKET_SIZE_MAX SERIAL_SVC_DATA_LEN_MAX
 
@@ -20,6 +23,12 @@ extern "C" {
  */
 void furi_hal_bt_init();
 
+/** Start 2nd core and BLE stack
+ *
+ * @return true on success
+ */
+bool furi_hal_bt_start_core2();
+
 /** Start BLE app
  * @param event_cb - BleEventCallback instance
  * @param context - pointer to context
@@ -52,6 +61,32 @@ void furi_hal_bt_dump_state(string_t buffer);
  */
 bool furi_hal_bt_is_alive();
 
+/** Get key storage buffer address and size
+ *
+ * @param       key_buff_addr   pointer to store buffer address
+ * @param       key_buff_size   pointer to store buffer size
+ *
+ * @return      true on success
+ */
+bool furi_hal_bt_get_key_storage_buff(uint8_t** key_buff_addr, uint16_t* key_buff_size);
+
+/** Get SRAM2 hardware semaphore
+ * @note Must be called before SRAM2 read/write operations
+ */
+void furi_hal_bt_nvm_sram_sem_acquire();
+
+/** Release SRAM2 hardware semaphore
+ * @note Must be called after SRAM2 read/write operations
+ */
+void furi_hal_bt_nvm_sram_sem_release();
+
+/** Set key storage change callback
+ *
+ * @param       callback    BleGlueKeyStorageChangedCallback instance
+ * @param       context     pointer to context
+ */
+void furi_hal_bt_set_key_storage_change_callback(BleGlueKeyStorageChangedCallback callback, void* context);
+
 /** Set data event callbacks
  * @param on_received_cb - SerialSvcDataReceivedCallback instance
  * @param on_sent_cb - SerialSvcDataSentCallback instance
@@ -65,16 +100,11 @@ void furi_hal_bt_set_data_event_callbacks(SerialSvcDataReceivedCallback on_recei
  */
 bool furi_hal_bt_tx(uint8_t* data, uint16_t size);
 
-/** Wait for Core2 startup */
-bool furi_hal_bt_wait_startup();
-
 /** Lock shared access to flash controller
  *
  * @param[in]  erase_flag  true if erase operation
- *
- * @return     true if lock was successful, false if not
  */
-bool furi_hal_bt_lock_flash(bool erase_flag);
+void furi_hal_bt_lock_flash(bool erase_flag);
 
 /** Unlock shared access to flash controller
  *