Adding skip some testcases for cisco-8000 platform (#5409)

Co-authored-by: Perumal Venkatesh <[email protected]>

Author: vperumal

tests/common/plugins/conditional_mark/tests_mark_conditions_platform_tests.yaml

@@ -272,7 +272,7 @@ platform_tests/api/test_psu.py::TestPsuApi::test_power:
   skip:
     reason: "Unsupported platform API"
     conditions:
-      - "asic_type in ['mellanox']"
+      - "asic_type in ['mellanox', 'cisco-8000']"
 
 #######################################
 #####    api/test_psu_fans.py     #####
@@ -338,7 +338,7 @@ platform_tests/api/test_sfp.py::TestSfpApi::test_get_rx_los:
   skip:
     reason: "Unsupported platform API"
     conditions:
-      - "asic_type in ['mellanox']"
+      - "asic_type in ['mellanox'] or (asic_type in ['cisco-8000'] and release in ['202012'])"
 
 platform_tests/api/test_sfp.py::TestSfpApi::test_get_rx_power:
   skip:
@@ -380,7 +380,7 @@ platform_tests/api/test_sfp.py::TestSfpApi::test_get_tx_fault:
   skip:
     reason: "Unsupported platform API"
     conditions:
-      - "asic_type in ['mellanox']"
+      - "asic_type in ['mellanox'] or (asic_type in ['cisco-8000'] and release in ['202012'])"
 
 platform_tests/api/test_sfp.py::TestSfpApi::test_get_tx_power:
   skip:
@@ -412,6 +412,12 @@ platform_tests/api/test_sfp.py::TestSfpApi::test_tx_disable_channel:
     conditions:
       - "asic_type in ['mellanox']"
 
+platform_tests/api/test_sfp.py::TestSfpApi::test_get_transceiver_threshold_info:
+  skip:
+    reason: "Unsupported platform API"
+    conditions:
+      - "asic_type in ['cisco-8000'] and release in ['202012']"
+
 #######################################
 #####     api/test_thermal.py     #####
 #######################################