[FS#1323] W8970 Lantiq ATK9K broken again

[LEDE Bugs]

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

User who did this - Geoffrey McRae (gnif) 

Attached to Project - OpenWrt/LEDE Project
Summary - W8970 Lantiq ATK9K broken again
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I just upgraded to OpenWRT to Chaos Calmer 15.05.1 and found that ATH9K is yet again broken on the W8970, the device is not visible in 'iw list'

After having a dig through the sources it seems the following patch was dropped/re-implemented/moved:

https://patchwork.ozlabs.org/patch/515498/

Relevant debug information:

root at OpenWRT:~# dmesg | grep ath
[    0.288000] ath9k,eeprom ath9k_eep: failed to load eeprom address
[    1.952000] ath9k,eeprom ath9k_eep: using led pin 0.
[    1.956000] ath9k,eeprom ath9k_eep: loaded ath9k eeprom

root at OpenWRT:~# lspci -s 01:00.0 -vvxx
01:00.0 Ethernet controller: Qualcomm Atheros AR5008 Wireless Network Adapter (rev 01)
        Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-