[sonic_sfp]: add logical_to_asic dict (#141)

Add mapping of logical port names to ASIC instance on device that used platform.json

Author: Wirut Getbamrung

sonic_platform_base/sonic_sfp/sfputilbase.py

@@ -448,6 +448,8 @@ def read_porttab_mappings(self, porttabfile, asic_inst=0):
                     else:
                         physical_to_logical[fp_port_index].append(intf_name)
 
+                    # Mapping of logical port names available on a system to ASIC instance
+                    self.logical_to_asic[intf_name] = asic_inst
                     port_pos_in_file +=1
 
                 self.logical = logical

sonic_platform_base/sonic_sfp/sfputilhelper.py

@@ -87,6 +87,8 @@ def read_porttab_mappings(self, porttabfile, asic_inst=0):
                     else:
                         physical_to_logical[fp_port_index].append(intf_name)
 
+                    # Mapping of logical port names available on a system to ASIC instance
+                    self.logical_to_asic[intf_name] = asic_inst
                     port_pos_in_file +=1
 
                 self.logical = logical