Serial refactor (#11521)

keyboards/mitosis/mitosis.c

@@ -1,9 +1,5 @@
 #include "mitosis.h"
 
-void uart_init(void) {
-	SERIAL_UART_INIT();
-}
-
 void led_init(void) {
 	DDRD  |= (1<<1); // Pin to green, set as output
 	PORTD |= (1<<1); // Turn it off
@@ -15,7 +11,6 @@ void matrix_init_kb(void) {
 	// put your keyboard start-up code here
 	// runs once when the firmware starts up
 	matrix_init_user();
-	uart_init();
 	led_init();
 }