examples/gps: Add default case for switch-warning of vendor extended sentence

Vendor may add extended sentence may not handled in switch, error if -Werror=switch enabled.
And extended sentence should not added to general examples.

Signed-off-by: wangjianyu3 <wangjianyu3@xiaomi.com>

examples/gps/gps_main.c

@@ -128,16 +128,7 @@ int main(int argc, FAR char *argv[])
             }
             break;
 
-          case MINMEA_INVALID:
+          default:
-          case MINMEA_UNKNOWN:
-          case MINMEA_SENTENCE_GSA:
-          case MINMEA_SENTENCE_GLL:
-          case MINMEA_SENTENCE_GST:
-          case MINMEA_SENTENCE_GSV:
-          case MINMEA_SENTENCE_GBS:
-          case MINMEA_SENTENCE_VTG:
-          case MINMEA_SENTENCE_ZDA:
-          case MINMEA_SENTENCE_LOR_LSQ:
             {
             }
             break;