stub out secure as its own feature

quantum/process_keycode/process_secure.c

@@ -0,0 +1,18 @@
+// Copyright 2022 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "secure.h"
+#include "process_secure.h"
+
+bool process_secure(uint16_t keycode, keyrecord_t *record) {
+    if (secure_is_unlocking()) {
+        if (!record->event.pressed) {
+            secure_keypress_event(record->event.key.row, record->event.key.col);
+        }
+
+        // Normal keypresses should be disabled until the sequence is completed
+        return false;
+    }
+
+    return true;
+}