[eeprom]: Add DB checksum field. (sonic-net#69)

Signed-off-by: Nazarii Hnydyn <nazariig@mellanox.com>

sonic_platform_base/sonic_eeprom/eeprom_tlvinfo.py

@@ -329,6 +329,15 @@ def read_eeprom_db(self):
             self.__print_db(client, self._TLV_CODE_VENDOR_EXT, num_vendor_ext)
 
         self.__print_db(client, self._TLV_CODE_CRC_32)
+
+        print("")
+
+        is_valid = client.hget('EEPROM_INFO|Checksum', 'Valid')
+        if is_valid != '1':
+            print("(*** checksum invalid)")
+        else:
+            print("(checksum valid)")
+
         return 0
 
     def update_eeprom_db(self, e):
@@ -379,6 +388,15 @@ def update_eeprom_db(self, e):
             client.hmset('EEPROM_INFO|{}'.format(hex(self._TLV_CODE_VENDOR_EXT)), fvs)
             fvs.clear()
 
+        (is_valid, valid_crc) = self.is_checksum_valid(e)
+        if is_valid:
+            fvs['Valid'] = '1'
+        else:
+            fvs['Valid'] = '0'
+
+        client.hmset('EEPROM_INFO|Checksum', fvs)
+        fvs.clear()
+
         fvs['Initialized'] = '1'
         client.hmset('EEPROM_INFO|State', fvs)
         return 0