[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>

applications/bt/bt_service/bt_i.h

@@ -25,6 +25,7 @@ typedef enum {
     BtMessageTypeUpdateStatusbar,
     BtMessageTypeUpdateBatteryLevel,
     BtMessageTypePinCodeShow,
+    BtMessageTypeKeysStorageUpdated,
 } BtMessageType;
 
 typedef union {
@@ -38,6 +39,8 @@ typedef struct {
 } BtMessage;
 
 struct Bt {
+    uint8_t* bt_keys_addr_start;
+    uint16_t bt_keys_size;
     BtSettings bt_settings;
     BtStatus status;
     osMessageQueueId_t message_queue;