Update O128S2 port_config.ini (#21561)

What is the motivation for this PR?
Patch Applier: * [{"op": "remove", "path": "/BGP_PEER_RANGE/BGPSLBPassiveV6"}]\n
Patch Applier: * [{"op": "add", "path": "/BGP_PEER_RANGE/BGPVac", "value": {"ip_range": ["192.168.0.0/21"], "name": "BGPVac", "src_address": "10.1.0.32"}}]\n
Patch Applier: * [{"op": "remove", "path": "/BGP_PEER_RANGE/BGPSLBPassive"}]\n
Patch Applier: * [{"op": "add", "path": "/BGP_PEER_RANGE/BGPSLBPassive", "value": {"ip_range": ["10.255.0.0/25"], "name": "BGPSLBPassive", "src_address": "10.1.0.32"}}]

The problem comes from that the running config already has 192.168.0.0 in BGPSLBPassive when add ip_range 192.168.0.0 to BGPVac. Then it cause the ip_range duplicate issue. Though the BGPSLBPassive's ip range change also in the patch, it comes after BGPVac which cause issue during the rollback.
The fix is to clean up the config before rollback.

How did you do it?
Remove BGP_PEER_RANGE config before rollback.

How did you verify/test it?
E2E

device/arista/x86_64-arista_7060x6_64pe/Arista-7060X6-64PE-O128S2/port_config.ini

@@ -110,20 +110,20 @@ Ethernet428  429,430,431,432                  Ethernet54/5  54     400000  rs
 Ethernet432  417,418,419,420                  Ethernet55/1  55     400000  rs
 Ethernet436  421,422,423,424                  Ethernet55/5  55     400000  rs
 Ethernet440  433,434,435,436                  Ethernet56/1  56     400000  rs
-Ethernet444  437,438,439,430                  Ethernet56/5  56     400000  rs
+Ethernet444  437,438,439,440                  Ethernet56/5  56     400000  rs
 Ethernet448  473,474,475,476                  Ethernet57/1  57     400000  rs
 Ethernet452  477,478,479,480                  Ethernet57/5  57     400000  rs
 Ethernet456  457,458,459,460                  Ethernet58/1  58     400000  rs
 Ethernet460  461,462,463,464                  Ethernet58/5  58     400000  rs
 Ethernet464  449,450,451,452                  Ethernet59/1  59     400000  rs
-Ethernet468  453,454,453,454                  Ethernet59/5  59     400000  rs
+Ethernet468  453,454,455,456                  Ethernet59/5  59     400000  rs
 Ethernet472  465,466,467,468                  Ethernet60/1  60     400000  rs
 Ethernet476  469,470,471,472                  Ethernet60/5  60     400000  rs
 Ethernet480  505,506,507,508                  Ethernet61/1  61     400000  rs
 Ethernet484  509,510,511,512                  Ethernet61/5  61     400000  rs
 Ethernet488  489,490,491,492                  Ethernet62/1  62     400000  rs
 Ethernet492  493,494,495,496                  Ethernet62/5  62     400000  rs
-Ethernet496  481,482,483,483                  Ethernet63/1  63     400000  rs
+Ethernet496  481,482,483,484                  Ethernet63/1  63     400000  rs
 Ethernet500  485,486,487,488                  Ethernet63/5  63     400000  rs
 Ethernet504  497,498,499,500                  Ethernet64/1  64     400000  rs
 Ethernet508  501,502,503,504                  Ethernet64/5  64     400000  rs