speaker and subwoofer should assign DAC(Volume) first instead of two
headphone by increasing badness for (type HP) when there is no line out

if (!spec->no_multi_io &&
            cfg->hp_outs && cfg->line_out_type == AUTO_PIN_SPEAKER_OUT)
                if (count_multiio_pins(codec, cfg->hp_pins[0]) >= 2)
                        spec->multi_ios = 1; /* give badness */


+if ((cfg->speaker_outs == 2) && (cfg->hp_outs == 2) && (cfg->line_outs == 0))
+          if (cfg->line_out_type == AUTO_PIN_HP_OUT)
+                   badness++

        /* re-count num_dacs and squash invalid entries */
        spec->multiout.num_dacs = 0;

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https://bugs.launchpad.net/bugs/1302090

Title:
  Dell Alienware 14, Speaker sound output is mono until a headphone jack
  is plugged

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