[FS#167] Enable sfp in kernel for clearfog pro

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - olze (olze) 

Attached to Project - LEDE Project
Summary - Enable sfp in kernel for clearfog pro 
Task Type - Feature Request
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I have a clearfog pro and my network is FTTH over a sfp module. Therefore i need sfp support in the kernel. 
Archlinux arm has a version for the clearfog which works, also armbian. Would be nice to have sfp support in lede too.

https://github.com/mxOBS/deb-pkg_kernel-xyz/tree/4.4.y-clearfog
https://archlinuxarm.org/platforms/armv7/marvell/clearfog

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=167