Revert "Fix conflicting types for 'tfp_printf' (#8269)"

This reverts commit e17b55e33a.

tmk_core/protocol/chibios/main.c

@@ -158,6 +158,9 @@ int main(void) {
     /* Init USB */
     init_usb_driver(&USB_DRIVER);
 
+    /* init printf */
+    init_printf(NULL, sendchar_pf);
+
 #ifdef MIDI_ENABLE
     setup_midi();
 #endif

tmk_core/protocol/chibios/usb_main.c

@@ -796,7 +796,10 @@ int8_t sendchar(uint8_t c) {
 }
 #endif /* CONSOLE_ENABLE */
 
-void _putchar(char character) { sendchar(character); }
+void sendchar_pf(void *p, char c) {
+    (void)p;
+    sendchar((uint8_t)c);
+}
 
 #ifdef RAW_ENABLE
 void raw_hid_send(uint8_t *data, uint8_t length) {

tmk_core/protocol/chibios/usb_main.h

@@ -87,4 +87,6 @@ void console_flush_output(void);
 
 #endif /* CONSOLE_ENABLE */
 
+void sendchar_pf(void *p, char c);
+
 #endif /* _USB_MAIN_H_ */