staging: vt6656: Removed unused variable vt3342_vnt_threshold

Missing part of staging: vt6656: Remove unused rf_type in baseband.c

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/6e1ef287e66039f9013435f8fa1266de7387df2e.1647284830.git.philipp.g.hortmann@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>