Remove *_CALLBACK_ENABLE related code; Fix V2 Max device name

keyboards/keychron/q65_max/q65_max.c

@@ -27,10 +27,6 @@
 #    include "battery.h"
 #endif
 
-#ifdef KEYCHRON_CALLBACK_ENABLE
-bool keychron_task_kb(void);
-#endif
-
 #ifdef DIP_SWITCH_ENABLE
 bool dip_switch_update_kb(uint8_t index, bool active) {
     if (index == 0) {
@@ -55,11 +51,6 @@ void keyboard_post_init_kb(void) {
     encoder_cb_init();
 #endif
 
-#ifdef KEYCHRON_CALLBACK_ENABLE
-    factory_test_init();
-    register_record_process(process_record_keychron_kb, false);
-    register_keychron_task(keychron_task_kb, false);
-#endif
     keyboard_post_init_user();
 }