Add MFKey to firmware

applications/system/mfkey/plugin_interface.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#define PLUGIN_APP_ID      "mfkey"
+#define PLUGIN_API_VERSION 1
+
+typedef struct {
+    const char* name;
+    bool (*napi_mf_classic_mfkey32_nonces_check_presence)();
+    bool (*napi_mf_classic_nested_nonces_check_presence)();
+    MfClassicNonceArray* (
+        *napi_mf_classic_nonce_array_alloc)(KeysDict*, bool, KeysDict*, ProgramState*);
+    void (*napi_mf_classic_nonce_array_free)(MfClassicNonceArray*);
+} MfkeyPlugin;