flashy-86bde84

Sync platforms.thrift to openbmc repo

Summary:
Sync platforms.thrift to OpenBMC

Needed to generate flash-procedure mapping so yosemite5a7 maps to FlashCp

Test Plan:
Generated with
```
$ facebook/configerator_platforms_update.sh
```

Reviewed By: ryazwinski

Differential Revision: D113231071

fbshipit-source-id: 51695eb3dbc1e836b27ebcfcdca84e998ca8902a