print: Add '\r' whenever '\n' appears for actual serial consoles

kernel/print.c

@@ -122,6 +122,8 @@ int print(char *fmt, ...) {
 			}
 		} else {
 			putc(*c);
+			if (*c == '\n')
+				putc('\r');
 		}
 	}
 	va_end(arg);