[FS#1054] Fix MediaTek MT7621 CPU Frequency Detection

[LEDE Bugs]

The following task has a new comment added:

FS#1054 - Fix MediaTek MT7621 CPU Frequency Detection
User who did this - Mathias Kresin (mkresin)

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Since your patch is for a file that is provided by the linux kernel, you need to [[https://www.linux-mips.org/wiki/Submitting_Patches|send your change to the linux-mips list]] for inclusion first and [[https://lede-project.org/submitting-patches|backport the patch afterwards to LEDE]].

Please do not attach patches to the bugtracker. Especially not without a single line of explanation.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1054#comment3583