[FS#1515] Add Mediatek MT7628 EVB Support

[LEDE Bugs]

The following task has a new comment added:

FS#1515 - Add Mediatek MT7628 EVB Support
User who did this - Mathias Kresin (mkresin)

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Please try the following patch and report back whether the issue is fixed: https://www.kresin.me/files/0001-ramips-fix-mt7628-eval-board-pinmux.patch
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1515#comment4654