SpacemiT: Add SD card support, CPU freq scaling and other fixups

[pyavitz]

BPI-F3 / MusePi Pro

• SD card support (WIP)
• CPU freq scaling (WIP)

https://paste.armbian.com/vebelezife.yaml

SD card and CPU freq scaling is still being worked on upstream, but this at least gets us to a place that makes devel and testing easier.

root@musepipro:~# cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies
614400 819000 1000000 1228800 1600000 
root@musepipro:~# cat /sys/devices/system/cpu/cpufreq/policy0/scaling_available_governors
conservative ondemand userspace powersave performance schedutil 

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