Glath05a-64o: define new platform

[aalamsi22]

Description

NOTE: This is part of a series of PRs to add support for Glath05a-64o. The dependency chain of the PRs is as follows:

Glath05a-64o: define new platform #461
Glath05a-64o: platform manager #462 – Depends on #461
Glath05a-64o: add sensor_service support #467 – Depends on #462
Glath05a-64o: weutil config #468 – Depends on #462
Glath05a-64o: add fan_service config #469 – Depends on #467
Glath05a-64o: fw_util support #470 – Depends on #461
Glath05a-64o: bsp mapping #471 – Depends on #461
Glath05a-64o: platform mapping #472 – Depends on #471
Glath05a-64o: led service #473 – Depends on #472

• Add PlatformType to fboss_common.thrift
• Define the string definition for the platform type
• Updated PlatformProductInfo.cpp to identify Glath05a-64o

[aalamsi22]

See #511