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No more boot hangs

The recent kernel patch that fixes the rcu errors/crashes has been applied to U-Boot in Manjaro testing/unstable branches. 

https://gitlab.manjaro.org/manjaro-arm/packages/core/uboot-pinephone/-/commit/ebdfd9a4124276fdb2d636aaecb861c205b71d69

I have tested this on the 4 phones that randomly hang during boot. All 4 have passed 100 consecutive reboot cycles without hanging.

Hopefully this patch makes it into other distributions soon.

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