[Arista] [chassis] [platform] platform.json mismatch with platform_api_conn returned

[wenyiz2021]

Description

• Test_chassis.py::test_modules
o str2-7804-lc6-1 WARNING pmon#platform_api_server.py: API 'get_module_index' not implemented
 warning though, but not seen on other LCs or SUP

• Test_chassis.py::test_get_name
 SUP has mismatch. Please update platform.json file, name should be DCS-7800-SUP1A, not DCS-7800A-SUP1A
 LC6 has name mismatch, but not platform.json issue, LC6 returns wrong name from platform_api_conn
• name = chassis.get_name(platform_api_conn)

• platform_tests/api/test_module.py::TestModuleApi::test_get_maximum_consumed_power
o Failed: Module 0 max consumed power format appears incorrect -> platform_api_conn: this needs to be a float number on all LCs and SUP

• platform_tests/api/test_psu.py::TestPsuApi::test_get_name[str2-7804-sup-1] FAILED
• platform_tests/api/test_psu.py::TestPsuApi::test_led[str2-7804-sup-1] FAILED
o These 2 failures are due to same reason that SUP has 12 PSUs, but:
 (Pdb) duthost.facts.get("chassis").get("psus")
 []
o If we want PSUs on SUP, then please update platform.json, provide psu names and LEDs for every PSUs on SUP, LCs are fine bc no PSUs on them,
o OR, self.num_psus = int(chassis.get_num_psus(platform_api_conn))should return 0 PSUs

• platform_tests/api/test_psu.py::TestPsuApi::test_power[str2-7804-sup-1]
o platform_api_conn:
o E Failed: PSU 2 reading does not make sense (power:0.0, voltage:0.0, current:0.0), PSU 2 is not operational, Voltage 0.0 of PSU 2 is not in between 11.699 and 12.898, PSU 3 reading does not make sense (power:0.0, voltage:0.0, current:0.0), PSU 3 is not operational, Voltage 0.0 of PSU 3 is not in between 11.699 and 12.898, PSU 4 reading does not make sense (power:0.0, voltage:0.0, current:0.0), PSU 4 is not operational, Voltage 0.0 of PSU 4 is not in between 11.699 and 12.898, PSU 5 reading does not make sense (power:0.0, voltage:0.0, current:0.0), PSU 5 is not operational, Voltage 0.0 of PSU 5 is not in between 11.699 and 12.898

• platform_tests/api/test_psu_fans.py::TestPsuFans::test_get_name[str2-7804-sup-1] FAILED
o missing psu fans name in platform.json

• platform_tests/api/test_psu_fans.py::TestPsuFans::test_get_speed[str2-7804-sup-1] FAILED
o platform_api_conn return 0 speed. Expecting psu fan speed 0-100

• platform_tests/api/test_psu_fans.py::TestPsuFans::test_set_fans_led[str2-7804-sup-1] FAILED
o psu_fan.get_status_led(platform_api_conn, j, i) always returns ‘off’ status
•

assigning to @Staphylo as this platform.json merged from #9717

Steps to reproduce the issue:

1. run platform_tests/api/test_chassis.py::TestChassisApi::test_get_name

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[wenyiz2021]

#12714
#12667
#12627
fixed these info