[FS#153] KERNEL_DYNAMIC_FTRACE=y on mips => panic

[LEDE Bugs]

The following task has a new comment added:

FS#153 - KERNEL_DYNAMIC_FTRACE=y on mips => panic 
User who did this - Alexander Couzens (lynxis)

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I've a working patch to fix this. I'm testing the fix with a vanilla kernel to upstream it.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=153#comment3813