meru800biab: add platform and PM support

[aalamsi22]

Description

This is part of a series of PRs to add support for meru800biab

This PR adds platform support and platform manager support.

Changes summary

• Bsp mapping; maps to the same file as meru800bia.
• Product mapping added.
• fruid.json on fboss/oss/scripts/run_configs/j3b/fruid.json. Although moslty identical to that of meru800bia, the product name is different and requires a new file.
• Platform manager config and eeprom fix addressed in https:/facebookexternal/fboss.bsp.arista/pull/31/files is applied to meru800biab

Test

platform Manager

platform_manager[5660]: I1004 19:14:04.914047  5660 PlatformExplorer.cpp:734] Reporting firmware version for FAN_CPLD - version string:1.0 ODS value:1000
platform_manager[5660]: I1004 19:14:04.914086  5660 PlatformExplorer.cpp:734] Reporting firmware version for MERU800BIA_SMB_FPGA - version string:4.14 ODS value:4014
platform_manager[5660]: I1004 19:14:04.914118  5660 PlatformExplorer.cpp:734] Reporting firmware version for MERU_SCM_CPLD - version string:4.13 ODS value:4013
platform_manager[5660]: I1004 19:14:04.914132  5660 PlatformExplorer.cpp:657] Concluding meru800biab exploration...
systemd[1]: Started FBOSS Platform Manager.
platform_manager[5660]: I1004 19:14:04.920422  5660 Main.cpp:40] Sent sd_notify ready by running command (systemd-notify --ready)
platform_manager[5660]: I1004 19:14:04.920429  5660 Main.cpp:75] Running PlatformManager thrift service...
platform_manager[5660]: I1004 19:14:04.921137  5660 ThriftServer.cpp:836] Using thread manager (resource pools not enabled) on address/port 5975: runtime: thriftFlagNotSet, , thrift flag: false, enable gflag: false, disable gflag: false

[facebook-github-bot]

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