Update MEATPACK test

buildroot/tests/FYSETC_S6

@@ -9,7 +9,7 @@ set -e
 # Build examples
 restore_configs
 use_example_configs FYSETC/S6
-opt_enable MEATPACK
+opt_enable MEATPACK_ON_SERIAL_PORT_1
 opt_set Y_DRIVER_TYPE TMC2209 Z_DRIVER_TYPE TMC2130
 exec_test $1 $2 "FYSETC S6 Example" "$3"