[IceCube] Remove backplane ports and change the medium type of 800G-4 from optical to backplane

Author: Rancho333-CLS

fboss/agent/platforms/common/icecube800bc/Icecube800bcPlatformMapping.cpp

@@ -88008,7 +88008,7 @@ constexpr auto kJsonPlatformMappingStr = R"(
           "numLanes": 4,
           "modulation": 2,
           "fec": 11,
-          "medium": 2,
+          "medium": 3,
           "interfaceType": 4
         }
       }

fboss/lib/platform_mapping_v2/generated_platform_mappings/icecube800bc_platform_mapping.json

@@ -87994,7 +87994,7 @@
           "numLanes": 4,
           "modulation": 2,
           "fec": 11,
-          "medium": 2,
+          "medium": 3,
           "interfaceType": 4
         }
       }

fboss/lib/platform_mapping_v2/platforms/icecube800bc/icecube800bc_profile_settings.csv

@@ -1,9 +1,6 @@
 Port_Speed(mbps),A_CHIP_TYPE,Z_CHIP_TYPE,NUM_LANES,Modulation,A_FEC,Z_FEC,MEDIA_TYPE,A_Interface_Type,Z_Interface_Type
 400000,NPU,TRANSCEIVER,2,PAM4,RS544_2N,,BACKPLANE,KR4,
-800000,NPU,TRANSCEIVER,4,PAM4,RS544_2N,,OPTICAL,KR8,
-800000,NPU,BACKPLANE,8,PAM4,RS544_2N,,BACKPLANE,KR8,
-800000,NPU,BACKPLANE,4,PAM4,RS544_2N,,BACKPLANE,KR8,
-400000,NPU,BACKPLANE,2,PAM4,RS544_2N,,BACKPLANE,KR8,
+800000,NPU,TRANSCEIVER,4,PAM4,RS544_2N,,BACKPLANE,KR8,
 100000,NPU,TRANSCEIVER,4,NRZ,RS528,,COPPER,CR4,
 100000,NPU,TRANSCEIVER,4,NRZ,RS528,,OPTICAL,SR4,
 200000,NPU,TRANSCEIVER,4,PAM4,RS544_2N,,BACKPLANE,KR4,