configurations: catalina_pdb: add missing sensor of PDB Brick board

Add missing sensor "PDB_RETURN_VDROP_VOLT_V" on PDB Brick board.

Tested on PDB Brick board:
```
root@bmc:~# mfg-tool sensor-display 2>/dev/null | table-sensor-display | grep VDROP_
PDB_POSITIVE_VDROP_VOLT_V               ok              0.007           Volts           N/A     N/A     N/A     N/A     N/A     N/A
PDB_RETURN_VDROP_VOLT_V                 ok              0.011           Volts           N/A     N/A     N/A     N/A     N/A     N/A
```

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
Change-Id: I1bae81b67ad400ca8b520fce0e97f0a9975693e0
diff --git a/configurations/meta/catalina_pdb_hsc_ltc_fsc_max_vr_delta_gndsen_ina_p12vsen_ina_p12vfan_mps.json b/configurations/meta/catalina_pdb_hsc_ltc_fsc_max_vr_delta_gndsen_ina_p12vsen_ina_p12vfan_mps.json
index 5a0f140..9d10714 100644
--- a/configurations/meta/catalina_pdb_hsc_ltc_fsc_max_vr_delta_gndsen_ina_p12vsen_ina_p12vfan_mps.json
+++ b/configurations/meta/catalina_pdb_hsc_ltc_fsc_max_vr_delta_gndsen_ina_p12vsen_ina_p12vfan_mps.json
@@ -725,6 +725,18 @@
             "in0_Name": "PDB_POSITIVE_VDROP_VOLT_V"
         },
         {
+            "Address": "0x41",
+            "Bus": 17,
+            "Labels": [
+                "in0"
+            ],
+            "Name": "PDB_RETURN_VDROP",
+            "Type": "INA238",
+            "in0_Max": 1,
+            "in0_Min": -1,
+            "in0_Name": "PDB_RETURN_VDROP_VOLT_V"
+        },
+        {
             "Address": "0x44",
             "Bus": 23,
             "Labels": [