[BFN] Convert platform modules to python 3

[msosyak]

- Why I did it
To fix syntax error during xcvrd start in the latest SONiC

root@sonic:/# python3 /usr/local/bin/xcvrd
Traceback (most recent call last):
  File "/usr/local/bin/xcvrd", line 5, in <module>
    from xcvrd.xcvrd import main
  File "/usr/local/lib/python3.7/dist-packages/xcvrd/xcvrd.py", line 24, in <module>
    from .xcvrd_utilities import y_cable_helper
  File "/usr/local/lib/python3.7/dist-packages/xcvrd/xcvrd_utilities/y_cable_helper.py", line 11, in <module>
    from sonic_y_cable import y_cable
  File "/usr/local/lib/python3.7/dist-packages/sonic_y_cable/y_cable.py", line 10, in <module>
    import sonic_platform.platform
  File "/usr/local/lib/python3.7/dist-packages/sonic_platform/__init__.py", line 2, in <module>
    from . import platform
  File "/usr/local/lib/python3.7/dist-packages/sonic_platform/platform.py", line 12, in <module>
    from sonic_platform.chassis import Chassis
  File "/usr/local/lib/python3.7/dist-packages/sonic_platform/chassis.py", line 5, in <module>
    from sonic_platform.sfp import Sfp
  File "/usr/local/lib/python3.7/dist-packages/sonic_platform/sfp.py", line 49
    print "dependency on sysfs has been removed"
                                               ^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print("dependency on sysfs has been removed")?

- How I did it
Use print function instead of the print statement
- How to verify it
Check if xcvrd is started successfully

- Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[msosyak]

@jleveque Please review and merge this, also to make xcvrd fully work we also need to merge this sonic-net/sonic-platform-common#157