[FL-1059] T5577 write (#463)

* Api-hal-gpio: extend init functions
* App Lfrfid: separate protocol layer
* App Lfrfid: write EM key scene
* App Lfrfid: syntax fix

applications/lf-rfid/helpers/encoder-emmarine.h

@@ -19,5 +19,4 @@ private:
 
     uint64_t card_data;
     uint8_t card_data_index;
-    void write_nibble(bool low_nibble, uint8_t data);
 };