staging: vt6656: Removed unused variable bb_vga_0

Missing part of staging: vt6656: Remove unused rf_type in card.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/09f65cf4839b089ad38f28ff691d5146e6095e58.1647284830.git.philipp.g.hortmann@gmail.com


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