*Edited platform.json for 4600 & 4600C
*Edited hwsku.json and port_config.ini files for all the SKU's present under these platforms
Signed-off-by: Vivek Reddy Karri <vkarri@nvidia.com>
* Change port index in port_config.ini to 1-based
* Add default port index to port_config.ini, change platform plugins to accept 1-based port index
* fix port index in sfp_event.py