tools/intel_vbt_decode: Dump MIPI config for the correct panel

Currently dump_mipi_config() just dumps the data for the same
panel index six times. Actually dump the data for each of the
six possible panels as intended.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>