Why I did it
Seastone does not have the psu fans' status led, need to reflect it in platform.json.

How I did it
Set the psu fans status led available to false.

How to verify it
Verify it with platform_tests/api/test_psu_fans.py::TestPsuFans::test_set_fans_led case.

Why I did it
Seastone does not have the psu fans' status led, need to reflect it in platform.json.

How I did it
Set the psu fans status led available to false.

How to verify it
Verify it with platform_tests/api/test_psu_fans.py::TestPsuFans::test_set_fans_led case.

Why I did it
Seastone does not have the psu fans' status led, need to reflect it in platform.json.

How I did it
Set the psu fans status led available to false.

How to verify it
Verify it with platform_tests/api/test_psu_fans.py::TestPsuFans::test_set_fans_led case.

Related work items: sonic-net#276, sonic-net#305, sonic-net#332, sonic-net#338, sonic-net#339, sonic-net#1188, sonic-net#1192, sonic-net#1197, sonic-net#1206, sonic-net#1685, sonic-net#1690, sonic-net#1696, sonic-net#1699, sonic-net#1709, sonic-net#1727, sonic-net#1737, sonic-net#1741, sonic-net#1742, sonic-net#2511, sonic-net#2512, sonic-net#2532, sonic-net#2559, sonic-net#2626, sonic-net#2638, sonic-net#2645, sonic-net#2649, sonic-net#2660, sonic-net#2669, sonic-net#2670, sonic-net#2678, sonic-net#10084, sonic-net#11442, sonic-net#11873, sonic-net#12047, sonic-net#12110, sonic-net#12207, sonic-net#12529, sonic-net#12678, sonic-net#13235, sonic-net#13287, sonic-net#13372, sonic-net#13395, sonic-net#13456, sonic-net#13497, sonic-net#13522, sonic-net#13545, sonic-net#13547, sonic-net#13552, sonic-net#13569, sonic-net#13572, sonic-net#13578, sonic-net#13591, sonic-net#13611, sonic-net#13647, sonic-net#13649, sonic-net#13660, sonic-net#13710, sonic-net#13716, sonic-net#13724, sonic-net#13726, sonic-net#13732, sonic-net#13735, sonic-net#13739, sonic-net#13757, sonic-net#13786, sonic-net#13792, sonic-net#13800, sonic-net#13801, sonic-net#13802, sonic-net#13805, sonic-net#13806, sonic-net#13812, sonic-net#13814, sonic-net#13822, sonic-net#13831, sonic-net#13834, sonic-net#13847, sonic-net#13870, sonic-net#13882, sonic-net#13884, sonic-net#13885, sonic-net#13894, sonic-net#13895, sonic-net#13926, sonic-net#13932, sonic-net#13935, sonic-net#13942, sonic-net#13951, sonic-net#13953, sonic-net#13964

Why I did it
Seastone does not have the psu fans' status led, need to reflect it in platform.json.

How I did it
Set the psu fans status led available to false.

How to verify it
Verify it with platform_tests/api/test_psu_fans.py::TestPsuFans::test_set_fans_led case.

…202012 to internal-202012

Merge the commits from sonic-net/sonic-buildimage 202012 to internal-202012

Related work items: sonic-net#279, sonic-net#2666, sonic-net#2686, sonic-net#2692, sonic-net#12684, sonic-net#13803, sonic-net#13805, sonic-net#13911, sonic-net#13926, sonic-net#13930, sonic-net#13992, sonic-net#14006, sonic-net#14009, sonic-net#14012, sonic-net#14013, sonic-net#14025, sonic-net#14056, sonic-net#14066, sonic-net#14080, sonic-net#14111, sonic-net#14137, sonic-net#14138, sonic-net#14171, sonic-net#14202, sonic-net#14205, sonic-net#14220, sonic-net#14241