EM4x70 Unlock support. Send pin code to unlock tag.

include/em4x70.h

@@ -19,6 +19,10 @@ typedef struct {
     // Used for writing address
     uint8_t address;
     uint16_t word;
+
+    // PIN to unlock
+    uint32_t pin;
+
 } em4x70_data_t;
 
 #endif /* EM4X70_H__ */

include/pm3_cmd.h

@@ -518,6 +518,7 @@ typedef struct {
 #define CMD_LF_EM4X50_CHK                                                 0x0253
 #define CMD_LF_EM4X70_INFO                                                0x0260
 #define CMD_LF_EM4X70_WRITE                                               0x0261
+#define CMD_LF_EM4X70_UNLOCK                                              0x0262
 // Sampling configuration for LF reader/sniffer
 #define CMD_LF_SAMPLING_SET_CONFIG                                        0x021D
 #define CMD_LF_FSK_SIMULATE                                               0x021E