[FL-2315] USB Mode switch lock (#1036)

* usb mode switch lock
* lock_mutex removed
* Wait for session termination in rpc_cli, lock badusb and u2f if rpc session is opened

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

applications/u2f/u2f_app_i.h

@@ -15,6 +15,11 @@
 #include "u2f_hid.h"
 #include "u2f.h"
 
+typedef enum {
+    U2fAppErrorNoFiles,
+    U2fAppErrorCloseRpc,
+} U2fAppError;
+
 typedef enum {
     U2fCustomEventNone,
 
@@ -52,4 +57,5 @@ struct U2fApp {
     U2fData* u2f_instance;
     GpioCustomEvent event_cur;
     bool u2f_ready;
+    U2fAppError error;
 };