[xcvr] Add get_module_fw_info method to XcvrApi class.

[oleksandrivantsiv]

Signed-off-by: Oleksandr Ivantsiv oivantsiv@nvidia.com

Description

Add get_module_fw_info method to XcvrApi abstract class to prevent an error on execution of sfputil show fwversion command.

Motivation and Context

An exception was raised when the command was executed with xcvr specification that doesn't support operation:

sfputil show fwversion Ethernet0
Traceback (most recent call last):
  File "/usr/local/bin/sfputil", line 8, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.9/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/sfputil/main.py", line 872, in fwversion
    show_firmware_version(physical_port)
  File "/usr/local/lib/python3.9/dist-packages/sfputil/main.py", line 847, in show_firmware_version
    out = api.get_module_fw_info()
AttributeError: 'Sff8436Api' object has no attribute 'get_module_fw_info'

How Has This Been Tested?

Run sonic-mgmt/platform_tests/sfp tests

Additional Information (Optional)

[prgeor]

@oleksandrivantsiv thanks for fixing