feature: log level on kprintf (color)

fix: kprintf now uses concatenated strings for the flag

src/rtc/rtc.c

@@ -20,7 +20,7 @@ static uint8_t update_is_in_progress(void)
 static uint16_t read_register(uint16_t cmos_register)
 {
 	while (update_is_in_progress())
-		kprintf(0, "%d\n", update_is_in_progress());
+		kprintf("%d\n", update_is_in_progress());
 	return raw_read_register(cmos_register);
 }