Merge changes from topic "sb/terse-output"

* changes:
  Remove redundant error message in tftf_initialise_timer()
  Remove prints from VExpress NOR flash driver
  Remove prints in get_overall_test_result()
  Remove SHELL_COLOR build flag
  Do not print CPU MPID in mp_printf()
  Use vprintf() inside mp_printf()
  Add vprintf() in standard C library