[Mellanox] Fix typo "xSFP_VLOT_OFFSET" (#3118)

Variables SFP_VLOT_OFFSET and QSFP_VLOT_OFFSET containing the typo are originally defined in repo sonic-platform-common. The typo has been fixed in PR #33. However, some Mellanox-specific code hasn't updated correspondingly, which results in xcvrd fail to start.
This PR updates the variable name in Mellanox-specific code correspondingly to fix that.

device/mellanox/x86_64-mlnx_msn2700-r0/plugins/sfputil.py

@@ -464,7 +464,7 @@ def get_transceiver_dom_info_dict(self, port_num):
  else:
  return transceiver_dom_info_dict
 
- dom_voltage_raw = self._read_eeprom_specific_bytes_via_ethtool(port_num, (offset + QSFP_VLOT_OFFSET), QSFP_VOLT_WIDTH)
+ dom_voltage_raw = self._read_eeprom_specific_bytes_via_ethtool(port_num, (offset + QSFP_VOLT_OFFSET), QSFP_VOLT_WIDTH)
  if dom_voltage_raw is not None:
  dom_voltage_data = sfpd_obj.parse_voltage(dom_voltage_raw, 0)
  else:
@@ -533,7 +533,7 @@ def get_transceiver_dom_info_dict(self, port_num):
  dom_temperature_raw = eeprom_domraw[SFP_TEMPE_OFFSET:SFP_TEMPE_OFFSET+SFP_TEMPE_WIDTH]
  dom_temperature_data = sfpd_obj.parse_temperature(dom_temperature_raw, 0)
 
- dom_voltage_raw = eeprom_domraw[SFP_VLOT_OFFSET:SFP_VLOT_OFFSET+SFP_VOLT_WIDTH]
+ dom_voltage_raw = eeprom_domraw[SFP_VOLT_OFFSET:SFP_VOLT_OFFSET+SFP_VOLT_WIDTH]
  dom_voltage_data = sfpd_obj.parse_voltage(dom_voltage_raw, 0)
 
  dom_channel_monitor_raw = eeprom_domraw[SFP_CHANNL_MON_OFFSET:SFP_CHANNL_MON_OFFSET+SFP_CHANNL_MON_WIDTH]

platform/mellanox/mlnx-platform-api/sonic_platform/sfp.py

@@ -76,7 +76,7 @@
 QSFP_DOM_REV_WIDTH = 1
 QSFP_TEMPE_OFFSET = 22
 QSFP_TEMPE_WIDTH = 2
-QSFP_VLOT_OFFSET = 26
+QSFP_VOLT_OFFSET = 26
 QSFP_VOLT_WIDTH = 2
 QSFP_VERSION_COMPLIANCE_OFFSET = 1
 QSFP_VERSION_COMPLIANCE_WIDTH = 1
@@ -102,7 +102,7 @@
 
 SFP_TEMPE_OFFSET = 96
 SFP_TEMPE_WIDTH = 2
-SFP_VLOT_OFFSET = 98
+SFP_VOLT_OFFSET = 98
 SFP_VOLT_WIDTH = 2
 SFP_CHANNL_MON_OFFSET = 100
 SFP_CHANNL_MON_WIDTH = 6
@@ -617,7 +617,7 @@ def get_transceiver_bulk_status(self):
  transceiver_dom_info_dict['temperature'] = 'N/A'
 
  if self.dom_volt_supported:
- dom_voltage_raw = self._read_eeprom_specific_bytes((offset + QSFP_VLOT_OFFSET), QSFP_VOLT_WIDTH)
+ dom_voltage_raw = self._read_eeprom_specific_bytes((offset + QSFP_VOLT_OFFSET), QSFP_VOLT_WIDTH)
  if dom_voltage_raw is not None:
  dom_voltage_data = sfpd_obj.parse_voltage(dom_voltage_raw, 0)
  volt = self._convert_string_to_num(dom_voltage_data['data']['Vcc']['value'])
@@ -677,7 +677,7 @@ def get_transceiver_bulk_status(self):
  else:
  return None
 
- dom_voltage_raw = self._read_eeprom_specific_bytes((offset + SFP_VLOT_OFFSET), SFP_VOLT_WIDTH)
+ dom_voltage_raw = self._read_eeprom_specific_bytes((offset + SFP_VOLT_OFFSET), SFP_VOLT_WIDTH)
  if dom_voltage_raw is not None:
  dom_voltage_data = sfpd_obj.parse_voltage(dom_voltage_raw, 0)
  else:
@@ -979,7 +979,7 @@ def get_voltage(self):
  return None
 
  if self.dom_volt_supported:
- dom_voltage_raw = self._read_eeprom_specific_bytes((offset + QSFP_VLOT_OFFSET), QSFP_VOLT_WIDTH)
+ dom_voltage_raw = self._read_eeprom_specific_bytes((offset + QSFP_VOLT_OFFSET), QSFP_VOLT_WIDTH)
  if dom_voltage_raw is not None:
  dom_voltage_data = sfpd_obj.parse_voltage(dom_voltage_raw, 0)
  voltage = self._convert_string_to_num(dom_voltage_data['data']['Vcc']['value'])
@@ -996,7 +996,7 @@ def get_voltage(self):
 
  sfpd_obj._calibration_type = self.calibration
 
- dom_voltage_raw = self._read_eeprom_specific_bytes((offset + SFP_VLOT_OFFSET), SFP_VOLT_WIDTH)
+ dom_voltage_raw = self._read_eeprom_specific_bytes((offset + SFP_VOLT_OFFSET), SFP_VOLT_WIDTH)
  if dom_voltage_raw is not None:
  dom_voltage_data = sfpd_obj.parse_voltage(dom_voltage_raw, 0)
  voltage = self._convert_string_to_num(dom_voltage_data['data']['Vcc']['value'])