[FS#230] mt76 is broken on C50

[LEDE Bugs]

The following task has a new comment added:

FS#230 - mt76 is broken on C50
User who did this - nopnopnop (nopnopnop)

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Latest mt76 driver doesn't fix the 5GHz ac radio on C50.

Upload: 70-90mbps
Download: 10-20mbps

The speed is the same with wifi crypto off.

The BSSID is still wrong.

[    9.372662] Loading modules backported from Linux version wt-2016-10-03-1-g6fcb1a6
[    9.380468] Backport generated by backports.git backports-20160324-9-g0e38f5c
[    9.437523] mt76x2e 0000:01:00.0: ASIC revision: 76120044
[    9.448431] mt76x2e 0000:01:00.0: ROM patch already applied
[    9.456007] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[    9.461680] mt76x2e 0000:01:00.0: Build: 1
[    9.465864] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[    9.476832] mt76x2e 0000:01:00.0: Firmware running!
[    9.482679] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=230#comment661