Serial refactor (#11521)

keyboards/comet46/matrix.c

@@ -26,6 +26,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "util.h"
 #include "matrix.h"
 #include "timer.h"
+#include "protocol/serial.h"
 
 #if (MATRIX_COLS <= 8)
 #    define print_matrix_header()  print("\nr/c 01234567\n")
@@ -78,12 +79,11 @@ uint8_t matrix_cols(void) {
 void matrix_init(void) {
 
     matrix_init_quantum();
+    serial_init();
 }
 
 uint8_t matrix_scan(void)
 {
-    SERIAL_UART_INIT();
-
     uint32_t timeout = 0;
 
     //the s character requests the RF slave to send the matrix