add custom data for SP9SKP

custom_field_list.json

@@ -131,5 +131,18 @@
         ["flight_number", "none"],
         ["sonde_type", "none"]
     ]
-}
+},
+"SP9SKP": {
+    "comment": "SKP telemetry",
+    "struct": "<BBBBBHH",
+    "fields": [
+        ["fix_voltage", "battery_5v_byte"],
+        ["io_voltage", "battery_5v_byte"],
+        ["reset_voltage", "battery_5v_byte"],
+        ["pv_voltage", "divide_by_100"],
+        ["time_to_fix", "none"],
+        ["uv_max", "none"],
+        ["uv_avg", "none"]
+    ]
+    }
 }