purism-librem5: various fixes, upgrades
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librem5-base upgraded to v64: some tweaks to shipmode stuff, but otherwise nothing interesting for us
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actually install the mm-broadmobi-port-types udev rule
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add udev rule + service for enabling bluetooth for Sparklan WiFi adapters (fixes #2043 (closed))
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upgrade the sparklan / brcm fw to the latest version distributed by Purism