purism-librem5: upgrade to latest ucm, fix udev rule installation
This includes important changes that:
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fix ucm / call audio (hopefully...) (fixes #1752 (closed))
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correctly installs udev rules to re-enable power management and other things (fixes #1803 (closed))
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adds "lockdown mode" support, using a script from the OEM
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upgrades kernel (this was just thrown in to keep the kernel up to date, I don't believe any of the things above depend on this slightly newer kernel... but I only tested things above using this kernel!)